. Animal life as affected by the natural conditions of existence. Animal ecology. 72 THE IXl-LUENCE OF SUKROQNDINGS. without further proof assert the presence of chlorophyll in any animal, even if we could prove the animal's direct dependence on li^ht, or the similarity of the spectrum of the solution of the green pigment with that of chlorophyll, or even a possible agreement in the microscopic structui'e. Positive proof of its existence can be derived only by evidence of the presence of all the characteristic properties of true chlorophyll in the green colouring matter of the anima
. Animal life as affected by the natural conditions of existence. Animal ecology. 72 THE IXl-LUENCE OF SUKROQNDINGS. without further proof assert the presence of chlorophyll in any animal, even if we could prove the animal's direct dependence on li^ht, or the similarity of the spectrum of the solution of the green pigment with that of chlorophyll, or even a possible agreement in the microscopic structui'e. Positive proof of its existence can be derived only by evidence of the presence of all the characteristic properties of true chlorophyll in the green colouring matter of the animal. And it may at once be said that the decomposition of carbonic acid by green-coloured animals has never been proved by exact experiment.*. FlQ. 17.—Animals in which chlorophyll grains have been aetected. a, Slentor viridb; b, £«(/hnm vindis ; c, Vortex viridis. The first two are Infusoria, the last is a Tur- bellarian. The animals (fig. 17) in which it has been asserted that chlorophyll is present, belong exclusively to the Invertebrata. Among the Protozoa the following are the best known; Euglena, Stentor, many Piadiolaria and Spongilla; the green fresh-water polyp Hydi-a among the Coelenterata, and a few Turbellaria among the ; The arguments for the statement that the green colour of these creatures is actually due to chlorophyll are many and * Such a decomposition has been recently proved by the experi- ments of Mr. Patrick Gedde,? on the green Turbellarian worm, Comv luta SchiiU:ii.— (Traks.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Semper, C. (Carl), 1832-1893. New York, D. Appleton
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