524 Wisconsin Academy of Sciences , Arts , and Letters . 
The bases of the two original gametes may nearly always be 
traced to the budding of the second spore. (See figs. 2, 3 and 
4.) 
In the light of the above facts as to the primary uredo, it 
is of the utmost importance that still further forms with the 
abbreviated life cycle be carefully worked out. 
Madison , Wis ., May 1906 . 
LIST OF PAPERS. 
1. Blackman,, V. H. : On the fertilization, alternation of gen¬ 
erations, and general cytology of the Uredineae. Ann. 
Bot. f xviii: 323. — 1904. 
2. Blackman, V. H., and Fraser, H. C. I.: Further studies 
on the sexuality of the Uredineae. Ann . Bot., xx: 35. 
—1906. 
3. Christman, A. H.: Sexual reproduction in the rusts. Bot . 
Gaz., xix: 267.—1905. 
4. Richards, II. M.: On some points in the development of 
aecidia. Proc. Amler. Acad . Arts and Sci ., xxxi: 255.—* 
1896. 
