80 



part of March on the island of Culebra, where the faciHties of the 

 United States Naval Station were placed at their disposal. After- 

 ward, they joined the other members of the party, consisting of 

 Mrs. Britton, Miss Delia W. Marble, and Mr. John F. Cowell, 

 for a trip through the mountains of the interior of Porto Rico. 

 The dried specimens of plants secured by the expedition are 

 represented by about 1,700 field numbers, in addition to a large 

 amount of living material for the conservatories. 



The program of the spring course of Saturday afternoon lec- 

 tures at the New York Botanical Garden is as follows : 



April 21. "On the Correlation of Characters in Plants," by 

 Professor Hugo de Vries. 



April 28. "A Day at Hammarby, the Home of Linnaeus," 

 by Dr. W. A. Murrill. 



May 5. "A Historical Review of the Study of Fossil Plants," 

 by Arthur Hollick. 



May 12. "A Glimpse at the Development of Botany in 

 America," by Professor L. M. Underwood. 



May 19. "The Effects of Radium on Plants," by Dr. C. S. 

 Gager. 



May 26. " Some Botanical Features of Porto Rico," by Dr. 

 Marshall A. Howe. 



June 2. " Orchids ; Their Botanical P'eatures and Relation to 

 Horticulture," by Mr. Geo. V. Nash. 



June 9. " The Wild Vegetable Foods of the United States," 

 by Dr. H. H. Rusby. 



June 16. " The Origin and Adaptations of Desert Floras," by 

 Dr. D. T. MacDougai. 



June 23. "The Botanical Exploration of the West Indies," by 

 Dr. N. L. Britton. 



The lectures will be illustrated by lantern-slides and otherwise 

 and will begin at 4:30 P. M. Before the lectures, opportunity 

 will be given for inspection of conservatories, museums, library, 

 herbarium, herbaceous garden, hemlock forest, and other parts 

 of the grounds. The garden is reached by the Harlem Division 

 of the New York Central Railway to Bronx Park Station, or by 

 the Third Avenue Elevated Railway to Bronx Park. 



