Hi Journal of Comparative Neurology. 



ation is less for the opposite reason. He concludes that " in this single 

 brain we have the entire visual area marked out." We are somewhat 

 surprised to read in the concluding paragraph, "we have now, through 

 the early destruction of sense-organs and the subsequent examination of 

 the cortex, a means of experimentally determining in animals the limits 

 of the several sensory areas. For the feasibility of this plan, the experi- 

 ments of V. Gudden and his school already offer some indii-ect support.'''"^ 

 No doubt, however, what has already been done in this line will seem as 

 nothing in a few years when the investigations now making are made 

 public. 



Comparative Physiolocy and Psycholo(;y.1 



Although published some years ago, we call attention to this work as 

 one which by virtue of numerous original theories and suggestive colloca- 

 tions of facts from various sources deserves more attention than it may 

 have received. The fact that its standpoint is uncompromisingly evolu- 

 tionary, synthetic and monistic may make it a closed book to many. The 

 rapid advance of neurology during the years since many of the chapters 

 were written, has deprived some hypotheses, once very plausible, of a 

 footing on fact. 



In spite of the fact that the author's position and point of view differ 

 widely from those of the present reviewer, the latter welcomes sincerely 

 the effort to apply unflinchingly the data of physics and physiology to the 

 domain of mind. So long as this is done in an honest and undogmatic 

 way it must do good service to all interested in clearing the way and nar- 

 rowing the field of discussion. The author does not hesitate to define 

 mind as chemical affinity or an allied property of matter. Physiologically 

 he relies upon the law that function preceeds structure. For him "asso- 

 ciation consists in mean molecular or vibratile motion," as a result of 

 which "lines of least resistance" are produced. The following para- 

 graphs will indicate the drift : 



" Association of impressions, or the simultaneous action of two sen- 

 sations in lines of least resistance, build up the filaments which go to 

 form the sensory strands on the posterior and postero-lateral columns of 

 the cord, and simultaneously acting motions also build up the strands of 



\. S. V. Clevenger, M. 1>. W<irk by tlic atiovc title, Cliic;!},'!), 1SS5, .luiisoii, 

 McClurg .t Co. 



