The rise in the barometer at the beginning of rain, they agree with Mascart in attributing largely to the formation of vapor and the evaporation of moisture from rain falling through relatively dry air.
It appears that the evaporation in different years on this lake varies as much as 50 per centum of the minimum amount.
In the latter year the evaporation was enormous, being 47.
According to Russell the amount of evaporation depends largely on the state of the soil, going on much faster from a wet surface of the ground than from water; with dry ground the conditions are reversed.
Evaporation of the former evidential value of miracles.
Cover with the solution and put in a place slightly warm, so that the gradual evaporation of the water will help in the slow formation of the crystals.
Cover during evaporationwith some light protection from the dust.
By means of such vapor pressure control the large egg chamber is not only feasible but the rate of evaporation at once becomes subject to the control of the operator and we achieve a perfection in artificial incubation hitherto unattained.
In these tests we find that as a rule the evaporation of eggs under hens is less than in incubators.
In incubation practice it is highly desirable to change the position of eggs so that unevenness in temperature and evaporation will be balanced.
At Ontario the average evaporation ran from as low as 7 per cent.
If the final measure of the loss of weight by evaporation were the only criterion of correct conditions of moisture in the chick's body, the hatches that show 12 per cent.
Now, the rates ofevaporation from any moist object is determined by two factors: vapor pressure and the rate of movement of the air past the object.
Frozen poultry will keep almost indefinitely save for the drying out, which is due to the fact thatevaporation will proceed slowly even from a frozen body.
Let me first repeat that evaporation increases with increased air currents and with decreased vapor pressure.
This scheme effects a considerable saving in fuel cost and labor, but the bulkiness of construction and the woeful lack of evaporation control are still to be dealt with.
The latest effort along the lines of reducingevaporation is the sand tray machine that followed in the wake of the Ontario investigation.
While we have called attention to evaporation as the most pronounced fault of fall eggs, losses from other causes are greatly increased by the holding process.
The influence of air currents on evaporation is to increase it directly proportional with the rate of air movement.
So, too, in smell, although no visible evaporation takes place, still it is a fact that aeriform floating particles are thrown off from the sensible body, and actually taken in by the sentient.
Keep the bottle corked to prevent evaporation of the alcohol and to keep out the dust.
It is highly injurious to green timber, as by closing the pores and obstructingevaporation from the surface it prevents the seasoning of the wood and causes fermentation and decay within (see Appendix).
Evaporation is almost always proceeding over seas and oceans, and from foam thrown up and swept along by the winds the dissolved salts are liberated as solid particles.
By night the fall of temperature checks evaporation of this moisture, and when it reaches their surfaces, it may remain there in the form of dew-drops.
Table of rate of evaporation of water in different soils by Schübler 99 III.
The conditions which would favour nitrification in the subsoil are such as would enable air to penetrate it, as artificial drainage, a dry season, the growth of a luxuriant crop causing much evaporation of the water in the soil.
Evaporation goes on to the greatest extent in soils whose particles are compacted together, capillary action in this case taking place more freely, and effecting evaporation from a greater depth of soil.
They have been formed by the evaporation of an inland sea.
The following table by Schübler shows the rate at whichevaporation proceeds in different soils.
The amount of green surface presented by the large number of leaves of trees, from which the constant evaporation of water goes on, is very great.
Just as the state of the fineness of the soil-particles has an important influence on the absorptive power of soils, so, too, it is found, it has an important bearing on the rate at which evaporation takes place.
Each lays itself out to endure the long droughts of its almost rainless habitat by drinking as much as it can when opportunity offers, hoarding up the superfluous water for future use, and economising evaporation by every means in its power.
The cuticle is made up of cells placed side by side and more or less modified in shape by their mutual compression and by surface evaporation and drying.
This band produces the perioplic horn, the thin varnishlike layer of glistening horn, which forms the surface of the wall or "crust," and whose purpose seems to be to retard evaporation of moisture from the wall.
In addition to their importance in throwing offensive waste products out of the system, these glands tend to cool the skin and the entire economy of the animal through the evaporation of their watery secretion.
If there were no atmosphere, and that, as now, the equatorial climes were hot and the poles cold, evaporation would be continually going on at the equator, and condensation in the colder regions.
Sheltered from evaporation their flow is nearly as full in the autumn as in the time of general spring floods.
Even during the coldest weather evaporation never wholly ceases, and the sunshine that abounds between the storms is sufficiently powerful to melt the surface more or less through all the winter months.
The pulpy film thus formed becomes a sheet of paper, after the expulsion and evaporation of the water which served as a medium for their deposit.
As evaporation continues the skin becomes more hard and the color changes from yellow to brown.
The skin contains a sub-normal amount of moisture when the embalmer reaches these cases, which may be further reduced by outward evaporation and the dehydrating power of the embalming fluid.
In addition to this, water or a face solution should be used externally to prevent outward evaporation from further reducing the moisture in the skin.
When evaporation begins, the skin loses its softness and becomes slightly yellow in color.
If obtained from the slow evaporation of an alcoholic solution, it is usually in the form of four-sided pyramids or long prisms; but if obtained by speedy evaporation or rapid cooling, it appears as a white granular powder.
Some oxalate and carbonate of potassium were separated, and, on evaporationto a syrup, crystals of potassic phenyl-sulphate were obtained.
An ethereal solution on evaporation assumes dendritic forms, but may contain octahedra and four-sided prisms.
The evaporation of the chloroform is conducted at the ordinary temperature in four or five watch-glasses.
On evaporation of the benzene the alkaloidal residue may be dissolved in water, acidified with sulphuric acid, and after filtration, on adding ammonia in excess, thebaine and narcotine are precipitated, codeine remaining in solution.
On separation and evaporation of the chloroform, the residue (if much discoloured, or evidently impure) may be dissolved in alcohol or benzene, and recrystallised several times.
On the evaporation of the petroleum ether, it is seen whether the first portion is crystalline or amorphous, or whether the second leaves behind a strongly-smelling fluid mass, which denotes a volatile alkaloid.
On evaporationof the latter the phosphorus is recognised by its physical properties.
Nerves are first stimulated, and then their function for the time is annihilated; but on evaporation of the chloroform, the function is restored.
On evaporationof the petroleum ether, the nitro-benzene is left, perhaps mixed with fatty matters.
It is not built up of water-worn particles which have been rolled about and accumulated layer upon layer, but has been slowly precipitated during the gradualevaporation of water in which it was previously held in solution.
Water impregnated with carbonate of lime, for example, deposits that compound as soon as evaporation has carried off a certain percentage of the water itself, and the carbonic acid gas which it held.
By evaporation the water has given rise to deposits of rock-salt, gypsum and other materials.
In the case of a large hollow in a very dry climate the rate of evaporation may be sufficient to prevent the water from ever rising to the lip, so that there is no outflow to the sea, and a basin of internal drainage is the result.
By drainage, whereby the discharged rainfall is rapidly removed, and the evaporation is lessened, with a consequent diminution of rainfall and some increase in the general temperature of a country.
After satisfying himself of the truth of the fact -- that the evaporation was really greater by night than by day -- Mr. H.
But the great beauty and novelty of the theory was, that the evaporation was greater at night than in the day time.
My first theory was upon the amount of evaporation at Perth during the summer months.
The excessive dryness of the atmosphere proved that the evaporation at the end of the rainy, or winter season, must be very great indeed.
It proved most satisfactorily that the evaporation exceeded every thing of the kind known in any other part of the globe.
As the weather grew warmer -- when the thermometer stood daily at about 86 degrees in a cool room -- the nocturnal evaporation increased.
Auguste Lumière and Joseph Nicolas, of Lyons, conceived the idea of studying the effect upon venom of the prolonged action of the intense cold produced by the evaporation of liquid air.
This being at present impracticable on the large scale that would be required, such expedients as surface flooding and such cultivation of crops as would tend to check evaporation are suggested.
These facts prove, that evaporation alone carries off a very considerable quantity of water, and it is from this great evaporation from the Mediterranean that the ocean continually flows thither through the straits of Gibraltar.
By moderating the winds this process has a marked effect on temperature and evaporation and is so beneficial to crops that in the aggregate it furnishes a striking example of successful "weather-making" by mankind.
As a rule the gauge has a funnel-shaped receiver with a small opening through which the water flows into the lower part of the gauge; loss of the accumulated water by evaporation is thus checked.
The rate of evaporation from the skin, also, has a marked effect upon our sensations of comfort and discomfort.
Another plan occasionally suggested is to sprinkle the atmosphere aloft with liquid air or liquid carbon dioxide, in order to lower the temperature, by the rapid evaporation of these substances, below the point of condensation.
People are hardly conscious of high relative humidity except when, in hot weather, it retards the evaporation of perspiration, and the latter collects in liquid form on the skin.
A small contingent of atmospheric dust consists of common salt (sodium chloride) due to the evaporation of spray from the ocean.
The wet-bulb thermometer is cooled by evaporation below the air temperature, except when the air is saturated with moisture, and may therefore give a rough indication of the temperature acquired by the skin when moistened with perspiration.
Fahrenheit, by the rapid evaporation of the liquid under greatly reduced pressure.
The harmattan of West Africa is a dry, dusty wind from the Sahara, and one that feels relatively cool; perhaps on account of causing rapid evaporation from the skin.
The air feels dry when evaporation proceeds rapidly from our skin, either on account of low relative humidity, brisk air movement, or both.
In the case of alleged showers of "paper" the material has been found to be the crusts of dried algae, which form on the surface of the ground exposed by the evaporation of the water of shallow ponds.
The extraordinary evaporationwould of itself have produced refrigeration.
