When the other acids mentioned above are present in
the compound, we treat it as directed there.
From silicic acid, by evaporation with hydrochloric acid.
From sulphur or iodine, by decomposing with sulphuric acid and
separating this with baryta chloride.
* * * * *
RESEARCHES ON ANIMALS CONTAINING CHLOROPHYL.
[Footnote: Abstract of a paper "On the Nature and Functions of the
'Yellow Cells' of Radiolarians and Coelenterates," read to the Royal
Society of Edinburgh, on January 14, 1882, and published by permission
of the Council.--_Nature_.]
It is now nearly forty years since the presence of chlorophyl in certain
species of planarian worms was recognized by Schultze. Later observers
concluded that the green color of certain infusorians, of the common
fresh water hydra and of the fresh water sponge, was due to the same
pigment, but little more attention was paid to the subject until 1870,
when Ray Lankester applied the spectroscope to its investigation. He
thus considerably extended the list of chlorophyl containing animals,
and his results are summarized in Sachs' Botany (Eng. ed.
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