. Zoology. Zoology. 324 ZOOLOGY. had gradually become transformed into Artemia milJiau- senii." Sclimankewitscli also made the converse experi- ment with perfect success, for by breeding successive generations in salt water which he made weaker and weaker he brought Artemia milliauseidi back to Artemia salina. Semper adds that it was the constancy of the external conditions of life—the greater or less saltness of water—which in one case determined the character of Artemia milhausniii and in another that of Artemia salina. But the Eussian exjierimenter carried the experi- ment still furtli
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. Zoology. Zoology. 324 ZOOLOGY. had gradually become transformed into Artemia milJiau- senii." Sclimankewitscli also made the converse experi- ment with perfect success, for by breeding successive generations in salt water which he made weaker and weaker he brought Artemia milliauseidi back to Artemia salina. Semper adds that it was the constancy of the external conditions of life—the greater or less saltness of water—which in one case determined the character of Artemia milhausniii and in another that of Artemia salina. But the Eussian exjierimenter carried the experi- ment still furtlier: "lie kept Artemia, salina in salt water, which he constantly diluted by adding fresh water, till at last it was perfectly fresh; the crustaceans had meanwhile gone through several generations, and had gradually so completely changed their characters that finally they had acquired those of the genus Branchipus." * Specimens of Linmcea peregra from lakes near the Sea of Aral which are salt for some months and comparatively fresh "for others vary greatly from the normal form. A. 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 work.. Packard, A. S. (Alpheus Spring), 1839-1905. N. Y. , Holt