THE CRAYFISH. 



791 



other living things, that the reader is supposed to enter upon the con- 

 sideration of the facts which Professor Huxley lays before him. 



No pains have been spared in the illustration of the text — the 

 woodcuts (eighty-one in number) reflecting great credit both on the 

 artist for his skill and on the jDublisher for his enterprise. We have, 

 after a general disquisition on the natural history of the crayfish (by 



Fio. 2.— AsTACus LEPTODACTTi^us (after Rathke. one third natural size). 



no means the least interesting in the book),' two devoted to the con- 

 sideration of the crayfish as a mechanism — in fact, its physiology. 

 Here a good deal of the anatomy is given and considered from the 

 point of view involved in the question, " What does it do ? " Then 

 we have the morphology of the English crayfish — the structure and 

 development of the individual minutely set forth, even each joint of 

 each leg, and each tuft on each gill, and each group of hairs, being 

 described and figured. We are enabled by the courtesy of the pub- 



