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mutations in seeds from various parts of the world, and for 
making detailed anatomical studies of the newly One ae 
forms. 
In addition other species of the evening-primrose have 
been brought under cultivation and tested in purely pedi- 
greed cultures with the result that some of these have been 
found to be in a mutating condition also. It is too early to 
make definite statements about all of them, but the common 
species Oenothera biennis has been seen to give rise to an 
atypic form which constitutes about one in two hundred of 
the progeny, and which has been brought to maturity in a 
number of individuals. It is now in the second generation, 
and is to be included among the forms which arise by salta- 
tory inheritance. 
The cultures for 1905 furnished three different types of 
bud-sports, and these have been guarded so that pure seeds 
were procured, with a view to testing the heredity of such 
structures. 
Perhaps one of the most important results yet secured in 
these studies, if not in any experimental study of evolution, 
has been the induction of mutations in plants by osmotic and 
chemical stimulation of ovaries by various reagents. 
Earlier results in this subject were embodied in a paper 
prepared by the codperation of Miss A. M. Vail, Dr. J. K. 
Small, and Dr. G. H. Shull, entitled «*« Mutants and Hybrids 
of the Oenotheras”” which was issued as Publication 24 of 
the Carnegie Institution of Washington in March, 1905. 
Another still more extensive paper by Miss A. M. Vail, Dr. 
G. H. Shull and myself dealing with the mutations, varia- 
tions and relationships of the Oenotheras is in preparation and 
will also be offered the Carnegie Institution for publication. 
A lecture dealing with the more important conclusions 
brought out in these researches was delivered before the 
Barnard Botanical Club at Columbia University, December 
18, 1905, and will be published in the Mondst for January, 
1906. It has already been reprinted in advance under the 
title of ‘* Heredity and the Origin of Species.” 
