No. 498] 



NOTES AND LITERATURE 



429 



secondary place in the present treatise, yet have by no means 

 been entirely left out of account. We venture to think, however, 

 that the more valuable outcome of the experimental study of 

 regeneration lies less in a descriptive account of what takes 

 place than in the attempt to give an analysis of the problems 

 involved. 



The second half of the book, some 75 pages, deals with Trans- 

 plantation, or grafting, as it is more generally called. The more 

 limited data in this field receive ample consideration. 



The extensive literature of both subjects is arranged under 

 topical headings- an arrangement that will recommend itself 

 in the present case as preferable to the more usual methods of 

 giving selected bibliographies at the end of each chapter or en 

 bloc at the end of the book. We can not refrain, in passing, from 

 calling attention to a slight misprint in one of the English titles 

 that reads "The international factor in the regeneration of the 



Passing to a more detailed examination of Professor Kor- 

 schelt's book, we find that while the formation of new growths in 

 plants — more especially those cases where the new growth does 

 not come from latent buds — is included under the heading of 

 regenerative processes, the development of parts of the egg and 

 the regulative changes that take place in isolated blastomeres 

 and in fragments of the segmented egg are not included, despite 

 the fact that the restoration of the whole form by a nucleated 

 piece of a protozoon is described in some detail. Such limita- 

 tions of the subject are, in the opinion of the reviewer, rather 

 arbitrary; for, while it is unquestionably advantageous to limit 

 certain fields, and to bring together certain groups of more 

 closely related subjects, the fundamental problems of regenera- 

 tion involved in all eases where a part produces a new whole have 

 so much in common that the study of the subject gains rather 

 than loses by taking as broad and as general an aspect of the 

 subject as possible. 



The mast recent work on the regeneration of entire plants from 

 leaves, as illustrated by the work of Goebel, Hildebrand, Winkler, 

 Vochting, Nemec, Figdor and others is given in some detail in 

 the opening chapter. It is pointed out that in many of these 

 cases the new plant does not come from preformed buds, and not 

 even from merismatic tissue in the case of Drosera according to 

 Winkler, but directly from one or more cells of the epidermis of 



