reason I publish it. I liavc upon numerous occasions observed 

 the momentary expulsion of spores from fungi such as Bulgaria 

 rufa and SarcoscypJia floccosa, but with these plants the spore- 

 discharge seems to occur when they are first touched, and then 



only. 



C. C. Hanmek. 



East Hartford, Conn., 

 July 27, 1905. 



REVIEWS 



Mutants and Hybrids of the Oenotheras' 



The literature of mutation grows apace. One of the latest 

 contributions to the subject is a publication of the Carnegie 

 Institution of Washington with the above title. The work is 

 copiously illustrated with many fine half-tone plates and cuts. 

 Professor MacDougal a year or two ago secured seeds of Oeno- 

 thera Laniarckiana and several other mutants from Professor 

 de Vries in Amsterdam. In a carefully guarded and securely 

 enclosed experimental ground at the New York Botanical Gar- 

 den experiments were instituted to determine the influence of 

 American conditions on the mutants of Oenothera secured by de 

 Vries. The results of the work of Professor MacDougal to date 

 constitute the basis of the report herein reviewed. 



It was deemed important to establish the original habitat of 

 Oenot/iera Laniarckiana if practicable. During the visit of Pro- 

 fessor de Vries to America in the summer of 1904, a visit was 

 paid, in company with the reviewer, to the herbarium of the Phila- 

 delphia Academy of Sciences, where a sheet considered to be 

 that of Oenotliera Laniarckiana was found, the specimen having 

 been collected by C. W. Short near Lexington, Kentucky. The 

 interest of a number of southern botanists was elicited in the 

 search for the plant, but up to the present no living wild plants 

 of Oenotliera Lainarckiana have been found. In connection with 

 this search, Professor S. M. Tracy rediscovered 0. grandiflora in 

 the original locality of Bartram. These discoveries, coupled with 



* MacDougal, D. T., assisted by Vail, A. M., Shull, G. H., and Small, J. K. 

 Mutants and Hybrids of the Oenotheras. Carnegie Institution of Washington, Publi- 

 cation No. 24. 1905. Papers of Station for Experimental Evolution at Cold Spring 

 Harbor, New York. No. 2. 



