1192 Recent Literature. [ December, 
nervous network of Aurelia, the constituent fibers, although fre- 
quently in contact, never actually unite.” 
Space forbids farther abstracts of the book. The author dis- 
cusses the regeneration of tissues, the excitable tissues of these 
animals regenerating themselves after injury with astonishing 
rapidity. Experiments were mace in section of naked-eyed Me- 
dusz ; on the coordination of movements, and on the natural and 
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Fic. 4.—Third mode of section in Aurelia. 
artificial rhythm in the pulsations of Meduse. The effect of poi- 
‘sons is discussed at length, particularly the effects of a change 
from salt water to fresh, as illustrated by the fresh-water Medusa, 
_ Limnocodium sowerbii (printed sorbii), of the tank in Regents 
_ Park (Fig. 5). It appears that a much less profound physiologi- 
cal change would be required to transmute a marine jelly-fish into 
jelly-fish adapted to inhabit brine, than would be required to 
