THE 



AMERICAN NATURALIST 



Vol. XLV November, 1911 No. 539 



THE ORIGIN OF SPECIES IN NATURE 1 

 DR. HENRI HUS 

 Missouri Botanical Garden 

 University of Michigan 



Among the duties of the botanist is that of adding to 

 the number of known species, varieties and forms. To 

 reach this end several ways are open. One may, by 

 studying the flora of new or insufficiently explored areas, 

 not only extend the range of species formerly known, but 

 add new species. The work of Setchell and his students, 

 especially Gardner, done on the algal flora of the Pacific 

 Coast, yields an excellent illustration. 2 



Sometimes it is possible to correlate with such investi- 

 gations work of economic value. The results obtained by 

 agricultural explorers working under the auspices of the 

 Office of Foreign Seed and Plant Introduction of the 

 Bureau of Plant Industry, U. S. Dept. of Agriculture and 

 other 3 institutions, offer a case in point. Such work, to 

 lead to the desired result, requires men of especial fit- 

 ness, physical, moral and mental. Not only must they 

 possess physical endurance to overcome the hardships 

 with which they necessarily meet. Moral courage, moral 

 strength are necessary to extricate them from the many 



