Ixx Journal of Comparative Neurology. 



with the possible exception of the pleural, are derived from the ectoderm 

 — the cerebral in part by invagination, the others exclusively by cell-pro- 

 liferation without invagination. The pedal ganglia are joined by two 

 distinct commissures, the anterior one being earlier. The buccal ganglia 

 make their appearance at about the same time as the pleural, and undergo 

 no change of position. 



BOOKS RECEIVED. 



Hopkins, L. P. Educational Psychology, a treatise for parents and edu- 

 cators. Lee and Shcpard, Boston ; 50 cents. 



The attempt is made to compress into the space of 96 small pages the 

 essentials of psychology. On the whole, this impossible task is as well 

 done as could be expected. A number of pages are devoted to the struc- 

 ture of the brain and these contain fewer errors than is usual in books of 

 this class. 



The cerebellum is described as similar in structure to the cerebrum 

 and as "incessantly distributing through all its fibrous connections a 

 continuous current of electric force through the nervous system, showing 

 itself in every conscicyis or unconscious nervous act." 



A more serious fault is a certain vagueness of expression which occa- 

 sionally appears in the subjective sections, but the volume will no doubt 

 serve a good purpose in awakening interest in the subject. 



Bergen, J. Y. and Bergen, Fanny D. A Primer of Darwinism. Lee 

 and Shepard, Boston; $1.25. 

 Well printed, usefully illustrated and well adapted to its purpose, 

 containing citations sufficient to indicate the sources. 



Dolbeer, a. E. Matter, Ether and Motion. Lee and Shepard, Boston; 

 $i-75- 

 A popular discussion of physical problems. It is an instructive in- 

 dex of modern tendencies that life is given a place among the chapters. 

 He says "there is little reason to doubt that, when they [the chemists] 

 shall be able to form the substance protoplasm, it will possess all the 

 properties it is now known to have, including life; and one ought not to 

 be surprised at its announcement any day." This will be news to the 

 j)hysiologists and physiological chemists who find even a proximate 



