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dations for a limited number of instructors or research students 

 in either zoology or botany. Members of the expedition may 

 leave New York on one of the steamers of the Quebec Steamship 

 Company's Line, either the middle of June, or, if more con- 

 venient, about the first of July. For further information address 

 Professor E. L. Mark, 109 Irving Street, Cambridge, Mass. 



The next annual session of the Biological Laboratory of the 

 Brooklyn Institute of Arts and Sciences located at Cold Spring 

 Harbor will be held during the months of July and August, 

 1909. The regular class work will begin on July 7, and con- 

 tinue for six weeks. The Laboratory offers courses in zoology 

 and botany, and facilities are promised to independent investiga- 

 tors ; excursions and evening lectures form additional features of 

 interest. The laboratory fee is ^30 ; board will be furnished stu- 

 dents for ^5 a week. For further information address Dr. Charles 

 Davenport, Cold Spring Harbor, Long Island, New York. 



The following illustrated lectures will be delivered in the lec- 

 ture hall of the museum building at the New York Botanical 

 Garden, Bronx Park, New York City, on Saturday afternoons, at 

 4:00 o'clock : 



April 24. "A Winter in Jamaica ", by Dr. William A. Murrill. 



May I. "Spring Flowers", by Dr. Nathaniel I.. Britton. 



May 8. " How Plants Grow ", by Dr. Herbert M. Richards. 



May 15. " Evergreens : How to Know and Cultivate Them", by Mr. George 

 V, Nash. 



May 22. " Collecting Seaweeds in Tropical Waters ", by Dr. Marshall A. Howe. 



May 29. " Vanilla and Its Substitutes", by Dr. Henry H. Rusby. 



June 5. " The Selection and Care of Shade Trees ", by Dr. William A. Murrill. 



June 12. "The Ice Age and Its Influence on the Vegetation of the World", 

 by Dr. Arthur HoUick. 



June 19. " Haiti, the Negro Republic, as seen by a Botanist", by Mr. George 

 V. Nash. 



June 26. " Some American Botanists of Former Days ", by Dr. John H. Barnhart. 



July 3. "An Expedition up the Peribonca River, Canada", by Dr. Carlton C. 

 Curtis. 



July 10. "Collecting Experiences in the West Indies", by Dr. Nathaniel L, 

 Britton. 



They will close in time for auditors to take the 5:34 train from 

 the Botanical Garden Station, arriving at Grand Central Station 

 at 6:04 p. M, 



