In no animals is there any white pigment; the white colour is like that of snow or foam, it is due to the complete reflection of the light from innumerable minute surfaces of crystals or bubbles.
The power of doubly refracting and polarizing is not possessed by all crystalline bodies, but only those belonging to other than the cubic system; crystals belonging to this system neither doubly refract nor polarize light.
To prepare crystals for examination by polarized light, a little Epsom salt, nitre, or borax should be dissolved in water, a drop placed upon a slide, and dried at a gentle heat.
The crystalsshould then be mounted in balsam, and viewed as transparent objects.
To see the cross and rings, the crystals should be sawn or cut across transversely, the ends being polished on a strained piece of silk moistened with water, and the sections mounted in balsam.
In all doubly refracting crystals there are one or more lines or directions in which the light is not doubly refracted.
In the honey of Polybia apicipennis, a wasp of tropical America, cane-sugar occurs incrystals of large size (Karsten, Pogg.
The name is an old one of German origin, and was used for any dark-coloured prismatic crystals from which metals could not be extracted.
The minutest crystalsmay show traces of crystalline outlines; undoubtedly they are of new formation and have originated in situ.
The dark-coloured porphyritic crystals of basalts are known as basaltic hornblende.
The commonest hornfelses (the "biotite hornfelses") are dark-brown to black with a somewhat velvety lustre owing to the abundance of small crystals of shining black mica.
He produced a new mineral, composed of the sulphurets of zinc and copper, which was found in brilliant blackcrystals in the roasted ores.
Octahedral crystals are obtained by the addition of borax, urea, &c.
The vapour tension of this crystallo-hydrate equals the atmospheric at 165°, and therefore the crystals may be dried in an atmosphere of steam and obtained without a mother liquor, whose vapour tension is greater.
Professor Glinka measured the transparent bright crystals of calcium hydroxide which are formed in common hydraulic (Portland) cement.
Very fine crystals are formed in a mass of gelatinous silica.
Crystals of the same substance which separate out at different temperatures may contain different amounts of water of crystallisation.
The acid sulphate, KHSO{4}, obtained easily by heatingcrystals of the normal salt with sulphuric acid, is frequently employed in chemical practice.
These grains are of quartz,--fine crystals of a rock which forms nearly three-quarters of the solid earth's substance.
The crystals of feldspar have smooth faces, while quartz breaks with a rough surface as glass does.
The Diamond Cave is one of the most splendid, for it is lined with walls and pillars of alabaster that sparkle in the torchlight with crystals that look like veritable diamonds.
Probably nothing is more beautiful than the flower-like crystals that bloom all over the walls of a chamber called "Mary's Bower.
After a filtering through wood-ashes, the water which held the nitre in solution was boiled down, and left to evaporate, after which the crystals of saltpetre remained.
Still others have clear, transparent crystals that make them gleam in the torches' light as if the walls were encrusted with diamonds.
Drop five or six of these little crystals into a large glass of limpid water.
To prepare these solutions, purchase of a druggist a small quantity of the solid crystals of the substance needed for the experiment you wish to try.
Dissolve the crystals in clear pure water, and keep the solution in a little bottle, labeled with the name.
Leave it undisturbed in the solution, and gradually the crystals will form all over the surface.
A physicist affirmed that he saw crystals of solid nitrogen and oxygen fall from the sky which gave rise to the fear that the atmosphere would shortly become decomposed.
Such is the ample cave which is exactly identical to the philosophy it shelters, with its crystals sparkling amid its uncertain shadows--full of precipices, it is true.
When granulated sugar is wanted, the crystals are placed in a great drum, which revolves until they are thoroughly dried in the right form.
To get the finest of salt, the crystalsmust be ground.
When evaporation is rapid, the salt crystals are quite small, but slower evaporation produces larger ones.
To make loaf sugar, the crystalsare pressed into molds, then dried, and cut into the size desired.
On allowing the slag to cool, it was found that small but perfectly defined crystals were formed.
Upon the cool portions of the tube a steel-grey sublimate is deposited, and, beyond that, can be discerned small crystals of selenic acid.
Place these crystals upon a filter, and wash them with a little cold water, until a solution of nitrate of silver ceases to exhibit any reaction upon the filtrate.
This oxide occurs in black needles or octahedral crystalsof great metallic lustre.
This oxide forms black crystals of great hardness, and is sometimes seen as a green powder.
This metal occurs occasionally in the slags of iron works, in the metallic state, as small cubical crystals of a red color.
The vapor crystallizes gradually, and coats the assay with small crystals which iridesce like mother of pearl (sesquioxide of antimony).
The nitrates being the least soluble, are first crystallized, and the remaining liquid, on farther evaporation, yields crystals of the nitroprusside.
These crystals are washed upon a filter, dried, and heated, to expel the crystal water, or until the mass ceases to swell up, and it is reduced to powder.
Immediately above the assay, yellow crystals are visible; these crystals are colorless after cooling, and the fused mass becomes light yellow-colored and crystalline.
It now exhibits an orange color, and is composed of needle crystals in a compact mass.
It so happens that in crystals of bismuth formed by the unagitated cooling of the melted metal, there occurs a natural resemblance of it almost perfect.
The green-stone is full of crystals of olivine, which, as they decompose, leave hollows, resembling those of scoriae.
As I commenced my first day in Europe, the sunbeams wavered and glistened on the frost-crystals that covered the trees, and the flood of light that poured full into my opening eyes was painfully dazzling.
Natural crystals were finely arranged in the shape of miniature caves and grottoes.
Rocks own no spring, are pregnant with no showers, Crystals and gems grow there instead of flowers; Instead of roses, beds of rubies sweat And emeralds recompense the violet.
When crystals of silver bromide are struck by beta particles, the silver atoms are ionized and form a latent image, so called because it is invisible to our eyes.
A photographic emulsion is a suspension of crystals of a silver halide (usually silver bromide) embedded in gelatin.
The solid variety prepared by Staedel forms colourless, prismatic crystals which melt at -2 deg.
Leduc at Nantes has made crystals grow from an artificial "egg" composed of certain chemicals.
The older and largercrystals grow more rapidly, by reason of their greater attractive force, than the newer and smaller ones on succeeding additions of sirup, so that the disparity in size will increase as the work proceeds.
He may take enough thin sirup into the pan to dissolve all of the crystals and begin again, or, if very skillful, he may so force the growth of the false grain as to bring it up to a size that can be worked.
The sugar which this contains is attracted to the crystals already formed, and goes to enlarge these rather than to form new crystals, provided the first are sufficiently numerous to receive the sugar as rapidly as it can crystallize.
The opinion that the reactions were due to cane sugar received repeated confirmations in the formation of true cane sugar crystals in sirups made from sorghum.
When beginning to form, the crystals are too minute to show either form or size, even when viewed through a strong magnifying glass.
This, too, is likely to attract more attention than the delicate, thin cloud of crystals, and may be even confounded with the reflection and refraction of light, by which alone the minute crystals are determined.
When the proper density is reached the crystals sometimes fail to appear, and a fresh portion of cold sirup is allowed to enter the pan.
The diamond ring on his finger had scratched the glass, which, as all badly-cooled crystals are wont to do, shivered instantly at the contact, scattering its sparkling fragments in every direction like a Bologna flask.
Every one was ready to dash his glass into a thousand pieces except Gabriel Haller, who, being the last comer and therefore tolerably sober, was ashamed to destroy the expensive Venetian crystals so recklessly.
I had noticed that the salt crystals had for their base a species of gypsum, which I knew might be made of great service to us in our building operations as plaster.
From the appearance of the brilliant crystals round about us I suspected their nature.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "crystals" in a variety of sentences. We hope that you will now be able to make sentences using this word.
