The colourationof these presents numerous varieties; sometimes the face is of a corpse-like paleness, at others it preserves its natural colour.
The colouration of the face may be extended over all or nearly all the body.
Another weighty objection to the generally accepted theory of protective colouration is that some of the creatures which assimilate most closely to their environment are those which appear to be the least in need of such protection.
It would appear that hens having the colouration of their wild ancestors cannot breed cocks possessed of the requisite courage.
Equally inimical to the theory of protective colouration is the existence, side by side, of species which obtain their living in much the same manner.
Robinson very sagely points out (Knowledge, January 1909), the value for protective purposes of any given colouration must depend very largely on the state of the moon.
We desire merely to emphasise the fact that the phenomena of animal colouration almost force us to the conclusion that the colouring of each organism is the result of the development of a number of units.
To sum up, the observed facts of animal colouration seem to indicate that there are in each organism some twelve or thirteen centres of colouring, which we suggest may correspond with portions of the fertilised egg.
Or the property which we call colouration may not be derived from a molecule, it may be an expression in the relative positions of the various molecules in the fertilised egg.
Its colouration is very different, and quite that of a Sandpiper, while the pattern of Prosobonia is most singular.
Macaws of this colouration are mentioned by Du Tertre, De Rochefort, and others of the older authors as being found on Guadaloupe, Dominica and Martinique, and Mr. Clark has united them under one name.
Buller's type probably had been preserved in spirit, as the colouration of fresh specimens is very different to his description.
Certainly, however, the colouration in general is slightly more rufous than {78} in S.
Hippolyte cranchii, but the influence of the surroundings upon the colouration of this form was also satisfactorily analysed by these authors.
The mechanism and the conditions for the change in colouration were made clear through the beautiful investigations of Keeble and Gamble, on the colour-change in crustaceans.
Nobody who has not actually watched the process of the creeping of the chromatophores upon the blood-vessels would anticipate that the tiger-like colouration of the yolk-sac in the later stages of the development was brought about in this way.
A spherical shell of darkened biotite is first produced and the inner colouration is only effected as the more feeble ionisation along the track of the ray in course of ages gives rise to sufficient alteration of the mineral.
The colourationis not due to an accumulation of helium atoms, i.
As I have previously remarked, the theory of protective colouration has my deepest sympathy.
Mylius deals with the reaction of starch and cellulose with iodine, pointing out that the blue colouration depends upon the presence of water and iodides.
Starch was oxidised with permanganate, and a mixture of products obtained of which one gave a characteristic violet colouration with phloroglucol, with an absorption-band at the D line.
As I have repeatedly stated, pugnacity is a more valuable asset than protective colouration in the struggle for existence.
It must, therefore, be obvious to any sane person that neither natural nor sexual selection can be directly responsible for the colourationof many species of fly-catcher.
This precaution is necessary as the medium is liable to take up nitrites from the atmosphere, and an opinion as to the absence of nitrites in the cultivation is often based upon an equal colouration of the medium in the control tube.
In regular flowers, like the lilies, the colouration is equal.
Colouration and discolouration arise from the presence or absence of pigment in cells, and thus having, as it were independent sources, we should expect colour first to appear in spots.
Now, on our view, that colouration follows structure, we ought to find an absence of decoration in this structureless group.
It appears that colouration began--perhaps as a product of digestion--by the application of pigment to the organs of transparent creatures.
What is true of birds can be shown to be true of other and lower types; and this leads us to a very important conclusion--that colouration has been developed with the evolution of the sense of sight.
The structure and colouration of the true Medusae are so like that of the medusiform larvae of the other Hydrozoa, that they need not be particularly described.
Upon these two principles the whole of the colouration of nature seems to depend.
It is not our object to discuss these rival views; but they are here laid down in skeleton, that the nature of the problem of the principles of colouration may be easily understood.
From a colouration point of view, we might readily divide the animal kingdom into two classes, marked by the presence or absence of distinct organs.
In fact, if the cat be attentively remarked, it will clearly be seen that the colouration or pattern is regional, and dependent upon the structure of the cat.
This likeness is not a mark of near affinity; it affects no important character, but only the shape and colouration of the wings.
Their formidable means of defence makes for them the obscure colouration of other dusk-roaming mammals unnecessary, as they do not need concealment.
Moreover, the explanation seems incompatible with the graduated nature of the change, and also with the fact that not only colouration but size, is implicated.
Thirdly, according to my view of the action of panmixia as previously explained, no total discharge of colouration is likely to be caused by such action alone.
Titrate the boiling solution with the sodium phosphate till it ceases to give a brown colouration with potassium ferrocyanide.
Small quantities of chromate in neutral solution can be found by the dark or violet-red colouration imparted thereto on boiling with a dilute decoction of logwood.
Vanadium is detected by the red colouration produced by passing sulphuretted hydrogen into ammoniacal solutions for some time.
In general colourationit closely resembles the preceding insect, but is considerably paler, with the markings much more distinct.
This cockerel, whose male sex glands had been exchanged for female ones, developed the female body, and colouration so completely that expert breeders of the strain pronounced it a female.
It is characterized by the round head, sturdy size, and a colouration intermediate between that of the Iberians and Nordics, a colouration which may tend to brunette or blond according as either of these races is mixed with it.
The fact that all classes of nests occur with dull coloured birds in both sexes merely shows, as I have strongly maintained, that in most cases the character of the nest determines the colouration of the female, and not vice versâ.
No doubt there are many individual exceptions to the rule here indicated, because many and various causes have combined to determine both the colouration and the habits of birds.
In colouration there are several types in the different genera of Heliconidæ.
Acræa gea is copied in its very peculiar style of colouration by the female of Papilio cynorta, by Panopæa hirce, and by the female of Elymnias phegea.
But it is, in reality, as completely protected by its colouration as the most plainly coloured bird that flies.
Theseus, with a modifiedcolouration of the hind wings.
Unfortunately, the male Smew is a bird that does not approach the coast much, and the female, from her duller colouration and small size, is readily overlooked.
In its general colouration the Little Auk closely resembles the Razorbill, but it is less than half the size, and has a considerable amount of white on the wings.
On adding this reagent a blue colouration is produced but on stirring it rapidly changes to a bright yellow which is proportional in intensity to the amount of free chlorine present.
Phelps found that ortho-tolidine in acetic acid solution produced an intense yellow colouration with free chlorine and suggested the use of this reagent as a qualitative test for chlorine.
On the addition of a hydrochloric acid solution of this compound to a sample containing free chlorine a violet colouration is produced that can be matched in the usual way with standards.
Fe) give a blue colouration with the starch-iodide reagent and for this reason it is always advisable, whenever possible, to make a control test on the untreated water.
A bird may have the general colouration of true cafer combined with a well-developed nuchal crescent, or nearly pure auratus with the red malar stripes of a cafer.
On the other hand the two sexes in montanus are alike, and, if we take a standard from domesticus, we may fairly say that in montanus the hen has the colouration of the male.
One of the most successful and striking cases of protective colouration in young animals is found in wild swine.
These protective mantles often differ strikingly in pattern and colouration from those of their parents, and indicate that the young animals present the colouration and pattern of their remote forbears.
In fact, it is quite probable that they give through this varying colouration the "life-history" of their family.
Surely this is sufficient evidence that colouration and pattern-design is a useful camouflage device of the great struggle for existence.
Brown bread will show much more of the yellow colouration and less of the blue than white bread.
For the object of the work is to show, "that diversified colouration follows the chief lines of structure, and changes at points, such as the joints, where function changes.
Everywhere he argues as if colours were universally due to pigments; and in my opinion this unaccountable oversight is the gravest defect in Mr. Wallace's treatment both of the facts and the philosophy of colouration in the animal kingdom.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "colouration" in a variety of sentences. We hope that you will now be able to make sentences using this word.
