(21) 
Volumes 17 to 19. Monocotyledones. 
Volumes 20 to 30. Dicotyledones. 
The preparation of the work has been referred by the 
Scientific Directors of the Garden to a committee consisting 
of Professors L. M. Underwood and N. L. Britton. 
Volume 22, Part 1, including Podostemonaceae by George 
V. Nash, Crassulaceae by N. L. Britton and J. N. Rose, and 
Penthoraceae and Parnassiaceae by P. A. Rydberg, was 
issued May 22, 1905. 
Volume 22, Part 2, including Saxifragaceae and Hydran- 
geaceae by J. K. Small and P. A. Rydberg, Cunoniaceae, 
Iteaceae and Hamamelidaceae by N. L. Britton, Pteroste- 
monaceae by J. K. Small, Altingiaceae by Percy Wilson, 
and Phyllonomaceae by H. H. Rusby, was issued December 
18, 1905. 
Lectures 
Two series of lectures especially designed for members of 
the Garden and their friends have been given, one in the 
spring and one in the fall. The subjects treated are as 
follows : 
April 29. ‘The Indian and His Uses for Plants,” by Mr. 
Frederick V. Coville. 
May 6. ‘*The Pines and their Life History,” by Profes- 
sor Francis E. Lioyd. 
May 13. ‘* Botanical Aspects of Deserts of Arizona, Cali- 
fornia, Sonora and Baja California,” by Dr. D. T. Mac- 
May 20. ‘*The Coralline Seaweeds,” by Dr. Marshall 
May 27. ‘* Cuba,” by Dr. W. A. Murrill. 
June 3. ‘* Vegetable Poisons and their Strange Uses,” by 
October 7. ‘* Autumn Features of Native Trees and 
Shrubs,” by Dr. N. L. Britton. 
October 14. ‘* Botanical Explorations in Haiti,” by Mr. 
George V. Nash. 
October 21. ‘*The Faculties of Plants,” by Dr. D. T. 
MacDougal. 
