. The study of animal life . Fig. 65.—Side view of male Artemia salinn (enlarged).(From Chamberss Encyclop.) Schmankewitsch on certain small Crustaceans. Among thenumerous species of the brine-shrimp Artemia, the mostunlike arc A. saiina and A. milhausenii \ they differ in the en. XIX Influence of Habits and Surroundings 311 shape and size of the tail and in the respiratory appendagesborne by the legs ; they are not found together, but live inpools of different degrees of saltness. Now Schmankewitschtook specimens of ^. salina which live in the less salt water,. Fig. 66.—Tail-lobes of Artemia
. The study of animal life . Fig. 65.—Side view of male Artemia salinn (enlarged).(From Chamberss Encyclop.) Schmankewitsch on certain small Crustaceans. Among thenumerous species of the brine-shrimp Artemia, the mostunlike arc A. saiina and A. milhausenii \ they differ in the en. XIX Influence of Habits and Surroundings 311 shape and size of the tail and in the respiratory appendagesborne by the legs ; they are not found together, but live inpools of different degrees of saltness. Now Schmankewitschtook specimens of ^. salina which live in the less salt water,. Fig. 66.—Tail-lobes of Artemia salina (to the left) and o{ Artemia milha-usenii(to the right) ; between these four stages in the transformation of the one intothe other. (From Chamberss Ettcyclop.; after Schmankewitsch.) added salt gradually to the medium in which they wereliving, and in the course of generations turned them intoA. milhauseidi. He also reversed the process by fresheningthe water little by little. Moreover, he accustomed A. salinato entirely fresh water, and then found that the form hadchanged towards that of a related genus, Braitchipus. Thislast step has been adversely criticised, but it is allowed thatone species of brine-shrimp was changed into another. Many interesting experiments have been made on theeffect of chemical reagents on cells, but these are perhapsof most interest to the student of drugs. Still the fact thatthe form of a cell and its predominant phase of activitymay be entirely changed in this way is important, especiallywhen we remember that it was
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