231) 
Economic plants: Bundles of barley, oats, rice, rye, sorghum, 
wheat. Test tubes of grain threshed. Types of grains—Riker 
mount. 
fllustrating the principles of genetics: 
Pea seeds illustrating a dihybrid ratio (wrinkled, smooth, yel- 
ow, green )——Riker mounts or vials. 
Jimson weed (Datura )—Mount to show I’, segregation of spiny 
and smooth pods. 
Corn showing monohybrid and dihybrid ratios: 
Unmounted, in glass tubes, or in display cases. 
Sorghum—H ybrid vigor—Riker mount. 
Sorghum—Inheritance of seed color—Riker mount. 
Oats—Inheritance of hull color—Riker mount. 
Snapdragon—Inheritance of flower color-—Riker mount. 
— 
Te eas NY, 
The rapidly growing library of the Garden comprises at present 
about 21,000 volumes and about 18,000 pamphlets. This is not 
per- 
— 
a circulating library, but is open free for consultation to al 
sons daily (except Sundays and holidays) from 9 a.m. until 5 p.m. 
(Saturdays, 9 to 12). More than 1,000 periodicals and seria 
publications devoted to botany and closely related subjects are 
regularly 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. 
Bibhographical 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- 
