. The study of animal life . is suggestive but not convincing of the influence ofsurroundings. These two newt-Hke Amphibians differ slightlyfrom one another, in this especially that the Axolotl retainsits gills after it has developed lungs, while the Aniblystonialoses them. Both forms may reproduce, and they wereoriginally referred to different genera. But some Axolotlswhich had been kept with scant water in the Jardin desPlantes in Paris turned into the Amblystoma form ; the twoforms are different phases of the same animal. It was anatural inference that the Axolotls were those which hadremai
. The study of animal life . is suggestive but not convincing of the influence ofsurroundings. These two newt-Hke Amphibians differ slightlyfrom one another, in this especially that the Axolotl retainsits gills after it has developed lungs, while the Aniblystonialoses them. Both forms may reproduce, and they wereoriginally referred to different genera. But some Axolotlswhich had been kept with scant water in the Jardin desPlantes in Paris turned into the Amblystoma form ; the twoforms are different phases of the same animal. It was anatural inference that the Axolotls were those which hadremained or had been kept in the water, the Atnblystomaforms were those which got ashore. But both kinds maybe found in the water of the same lake and the metamor-phosis may take place in the water as well as on the these and for other reasons this oft-told tale is not 310 The Study of Animal Life part iv cogent. In another part of this book I have given examplesof the state of lifelessness which drought induces in some. Fir,. 64.—Axoloti (in the waterl :vnti Amblystoma (on the land). simple animals, and from which returning moisture canafter many days recall them. Changes may also be due to the chemical compositionof the medium, as was established by the experiments of
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