243 



Jimson weed (Datura) — Mount to show F 2 segregation of spiny 



and smooth pods. 

 Corn showing monohybrid and dihybrid ratios : 



Unmounted, in glass tubes, or in display cases. 

 Sorghum — Hybrid vigor — Riker mount. 

 Sorghum — Inheritance of seed color — Riker mount. 

 Oats — Inheritance of hull color — Riker mount. 



LIBRARY 



The rapidly growing library of the Garden comprises at present 

 about 22,000 volumes and about 19,000 pamphlets. This is not 

 a circulating library, but is open free for consultation to all per- 

 sons daily (except Sundays and holidays) from 9 a.m. until 5 p.m. 

 (Saturdays, 9 to 12). More than 1,000 periodicals and serial 

 publications devoted to botany and closely related subjects are 

 normally received. These include the transactions of scientific 

 societies from all quarters of the globe ; the bulletins, monographs, 

 reports, and other publications of various departments of the 

 United States Government, as well as those of foreign govern- 

 ments, and of all state agricultural experiment stations and agri- 

 cultural colleges; the publications of research laboratories, uni- 

 versities, botanic gardens, and other scientific institutions of the 

 world, as well as the files of independent journals devoted to the 

 various phases of plant life. The library is specially rich in pub- 

 lications of foreign countries and has a growing collection of 

 incunabula and other pre-Linnaean works. 



Bibliographical assistance is rendered to readers by members of 

 the Library staff. 



An annotated list of the incunabula, pre-Linnaean works, old 

 herbals, and other rare or historically important books in the Li- 

 brary was published as the July. 1935, number of the Botanic 

 Garden Record. Copies are for sale at 40 cents each. 



HLRBARIA 



The Phanerogamic Herbarium consists of more than 210,000 

 specimens of flowering plants, chiefly from North America. 

 Among the important collections represented is the herbarium of 



