No. 498] 



NOTES AND LITERATURE 



"If we look upon 111*- power to regenerate as a ]>roperty imma- 

 nent in the living substance, which seems not improbable, owing 

 to its wide oecnrrenee. we may still suppose that this property 

 has within certain lines of evolution been strengthened by adap- 

 tation and selection." 



The origin of the new material from the old. tin- process of 

 transformation (morphallaxis), the curious phenomenon of com- 

 pensatory regulation, the occurrence of polarity and the develop- 

 ment of heteromorphic structures are adequately dealt with from 

 an objective standpoint, although in our opinion all too briefly 

 considering the importance of the theoretical problems involved. 

 These parts of the book are followed by a discussion of the factors 

 of regeneration. The nature of the subject and the uncertainties 

 of the theoretical problems involved make it difficult to treat such 

 theoretical questions briefly and definitely, yet one could have 

 wished that so admirable a review and so judicious a treatment 



forcibly dealt with. Born's classical experiments with tadpoles, 

 that have led to so many far-reaching experiments in recent 



The later work of -rafting in amphibians, especially that of 

 Harrison and Spemann. is described ; but the author, while re- 



The author considers in some deL/the* modern work of trans- 

 plantation of small portions of the tissues and has brought to- 

 gether in readable form the results of the literature of the sub- 

 ject, that is widely scattered, often in journals little accessible 

 to zoologists. Korschelfs review will prove a useful source of 

 information in such matters. 



We cordially recommend Professor Korschelfs book as one of 



