304 NATURE-STUDY REVIEW [12:7-Oct. f 1916 



may need to make them as comfortable and as contented as pos- 

 sible. There are several good examples of this feature being car- 

 ried out under the management of the National Zoological Park, 

 however, and an excellent example of this is seen in the case of the 

 double-humped camel, which is illustrated in figure one of the pres- 

 ent article, it being a reproduction of a photograph of mine. In 

 the distance, we may plainly see in this picture an old, male yak 

 — another mammal which has been allotted, in this Park, a large 

 area to roam over. Nevertheless, there are not a few animals in 

 this place that severely suffer from being continually confined in 

 cramped quarters ; but of these I shall give examples at some other 

 time, when this matter is taken up again. 



Introduction to Neurology. C. Judson Herrick, pp. 355. W. B. 

 Saunders Co. $1.75. 

 A few sentences from the closing paragraphs of the work indicate 

 why the discoveries of the student of the nervous tissues are of such 

 interest to the educator. ' ' The educational period is limited to the 

 age during which the association centers, whose form is not pre- 

 determined in heredity remain plastic and capable of modifications 

 under environmental influence. Ultimately even the cerebral 

 cortex matures and loses its power of reacting except in fixed 

 modes." This quotation is from the last chapter on "The Evolu- 

 tion and Significance of the Cerebral Cortex," a consideration of 

 which is giving us one firm basis (the other is experimental educa- 

 tion) for educational procedure. Much of the book is tough read- 

 ing for the layman for it is intended to guide the student of the 

 nervous system in his anatomical and histological studies. But it is 

 worth wading through it to get the foundation for appreciating 

 such chapters as the one cited, the XVIIIth on Pain and Pleasure, 

 the XXth on the Functions of the Cerebral Cortex. The very 

 full index and glossary make it easy to look up special topics in 

 which one is from time to time interested. 



Free Rural Literature 



If any of our readers are looking for helpful free rural literature, 

 they should write to Garland A. Bricker, Professor of Rural Educa- 

 tion and Agricultural Teaching, College of Agriculture, Syracuse, 

 N. Y., who is sending out information on authentic matter. The 

 information is free, but a one-cent stamp should be inclosed to pay 

 reply postage. 



