The same statement can be made of all the many, many other known factors in development, from fecundity to concealing coloration; and behind them lie forces as to which we veil our ignorance by the use of high-sounding nomenclatureas when we use such a convenient but far from satisfactory term as orthogenesis.

It has been said that the brilliant hues of the coral-snake when in its native haunts really confer on it a concealing coloration.

The little fawn which we saw was spotted; the grown deer had lost the spots; if the spots do really help to conceal the wearer, it is evident that the deer has found the original concealing coloration of so little value that it has actually been lost in the course of the development of the species.

It blurred out all distinction between myself and the peasants, forming a perfect protective coloration.

They are also interesting because they offer such illuminating examples of the truth that many of the most common and successful birds not merely lack a concealing coloration, but possess a coloration which is in the highest degree revealing.

They are also interesting because they offer such illuminating examples of the truth that many of the most common and successful birds not merely lack a concealing coloration, but possess a coloration which is in the highest degree revealing.

Indeed, it seems astonishing, when one observes these big beastsand big waders and other water-birdsin their native surroundings, to find how utterly non-harmful their often strikingly revealing coloration is.

It is hard to imagine a more conspicuous bird than the silver-bill; but the next and last tyrant flycatcher of which I shall speak possesses on the whole the most advertising coloration of any small bird I have ever seen in the open country, and moreover this advertising coloration exists in both sexes and throughout the year.