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Driesch had given an experimental basis for this theory at an earlier stage, in his experiments on the initial stages of the development of sea-urchins, starfishes, zoophytes, and the like. A Planarian worm cut into pieces developed a new worm of smaller size from each part. A mutilated Pluteus larva developed a new food-canal, and restored the whole typical form.
From sulphur or iodine, by decomposing with sulphuric acid and separating this with baryta chloride. It is now nearly forty years since the presence of chlorophyl in certain species of planarian worms was recognized by Schultze.
In 1878 I had the good fortune to find at Roscoff the material for the solution of the problem in the grass-green planarian, Convoluta schultzii, of which multitudes are to be found in certain localities on the coast, lying on the sand, covered only by an inch or two of water, and apparently basking in the sun.
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