Abstract
In a paper, read before the Royal Society in 1883, I described the results of an examination of the so-called “bile” of invertebrates, and proved that the alcohol extracts of the “liver,” or other appendage of the intestine answering to it, showed a spectrum so like that of vegetable chlorophyll as to have led me to conclude that no essential difference exists between the spectrum of enterochlorophyll and plant chlorophyll. At that time I could not decide the points which are now considered.

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