2 2 THE PLANT WORLD. 



radioactive microscopic slide : Apparatus for growing 

 plants in a radioactive atmosphere. 



(e) Photomicrographs of cross-sections of American woods 

 (purchased from Mr. James A. Neale, Liverpool, Eng- 

 land. 



(/) The tropical laboratory of the Garden at Cinchona, 

 Jamaica. Views of the laboratory, residence, and 

 wild and cultivated flora. 



(g) Botanical garden. Castleton, Jamaica. Photos showing 

 additional facilities available to students registered at 

 the tropical laboratory of the (iarden. 



(h) Hope Botanical Garden and vicinity, Jamaica. Photos 

 showing facilities also available to students registered 

 at the tropical laboratory of the garden. 

 Exhibited by the New York Botanical Garden, Nathaniel 

 L. Britton, Director. 



2. Photographs showing effects of radioactivity on plants. Ex- 



hibited by C. Stuart Gager. 



3. Tuber formation in Solanum Tuberosum in daylight. Ex- 



hibited by C. Stuart Gager. 



4. Photographs of Guiincra nianicata in flower. Exhibited by 



C. Stuart Gager. 



5. A new chestnut disease : Drawings and specimens. Exhibited 



by W. A. Murrill. 



6. Regeneration in plants : Specimens and photographs. Ex- 



hibited by Elsie Kupfer. 



7. The relation of mechanical injury to fasciation in the evening" 



primrose : Specimens and photographs. Exhibited by Alice 

 A. Knox. 



8. Magnesium as a stimulant to plant growth. Exhibited by 



Gertrude S. Burlingham. 



9. Botanical features of the mainland keys of Florida : Map, 



photos and herbarium specimens. Exhibited by John K. 

 Small. 

 10. New and interesting additions to the moss flora of the West 

 Indies : Specimens and drawings. Exhibited by Elizabeth 

 G. Britton. 



