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No. 116. Notes on Rosaceae, by Per Axel Rydberg. 
No. 117. Studies in North American Peronosporales —IV. 
Host Index, by Guy West Wilson. 
Nortu AMERICAN FLORA 
This work, designed to include descriptions of all known 
plants native to North America, Central America and the 
West Indies, is being issued in parts at irregular intervals as 
rapidly as these parts can be prepared. 
Volume 9g, part 2, by W. A. Murrill, completing the Poly- 
poraceae, was issued March 12, 1908. 
Volume 22, part 3, containing descriptions of the Family 
Grossulariaceae by F. V. Coville and N. L. Britton, the Plan-. 
tanaceae by H. A. Gleason, the Crossosomataceae by J. K. 
Small, the Connaraceae by N. L. Britton, the Calycantha- 
ceae by C. L. Pollard, and the Rosaceae (pars) by P. A. 
Rydberg, was issued June 12, 1908. 
Volume 22, part 4, containing descriptions of the Family 
Rosaceae (pars) by P. A. Rydberg, was issued November 
20, 1908. 
Lectures 
Pusiic Lectures 
Two courses of illustrated public lectures on botanical sub- 
jects have been given in the museum building on Saturday 
afternoons, as follows: 
May 2. ‘‘ Botanical Expedition to Jamaica,” by Dr. Arthur 
Hollick. 
May 9. ‘‘Early-Flowering Trees and Shrubs,” by Dr. 
N. L. Britton. 
May 16. ‘*Plant Life of the Sea,” by Dr. M. A. Howe. 
May 23. ‘Ornamental Shrubs; Their Selection and 
Arrangement,” by Mr. G. V. Nash. 
May 30. ‘Plants that Feed on Insects,” by Dr. C. S. 
Gager. 
June 6.  ‘* Adulterants in Foods and Drugs and their 
Detection,” by Dr. H. H. Rusby. 
