I 62 THE PLANT WORLD 



but he finds no notable difference between the general varia- 

 bility of a stable species and one which is in a state of mu- 

 tability. 



A masterly work on bud-\'ariation by Dr. P. J. S. Cramer 

 has recently appeared in the proceedings of the Scientific So- 

 ciety of Holland. By the examination of literature and of 

 living plants the author has brought together the authenti- 

 cated facts concerning sports in over six hundred species, and 

 the availability of this data has enabled the author to 

 present a comprehensive view of the subject that will make 

 this book the most valuable which has yet appeared dealing 

 with this phase of phylogeny. 



Prof. H. B. Humphrey (B. S. Univ. of Minn., 1899 and 

 Ph. D. Stanford University, 1907) has recently been ap- 

 pointeci assistant professor of botany in the State College of 

 Washington, and also assistant botanist of the state agri- 

 cultural experiment station, both institutions being located at 

 Pullman, Washington. 



Of the various exercises already held and planned by 

 various societies in commemoration of the fiftieth anniversary 

 of the appearance of the "Origin of Species," by Darwin 

 and Wallace, those held by the Linnean Society of London 

 must rank among the most notable, especially as it was before 

 this Society that the first essay entitled "On the tendency of 

 species to form varieties; and on the perpetuation of varieties 

 and species by natural means of selection," by Darwin anci 

 Wallace, was presented on July i, 1858. The commemora- 

 tion exercises were made notable by the fact that Wallace 

 was able to attend in person and gave a description of the 

 actual relations existing between Darwin and himself in elab- 

 oration of the idea of natural selection. The proceedings, 

 which will include a lecture on "The Jurassic vegetation 

 of the world: a study in plant-migration," by Professor 

 Seward, will be published in a separate volume. 



