2?>?> 



Corn showing nion()li_\'l)ri(l and dihylirid ratios : 



38. Ears of ])arcnts and F^ — seed of F^ in vial — un- 

 mounted. 

 ^9. Same mounted in glass covered display case. 

 40. F^ ears in glass tubes — for counting kernels. 



41. Sorghum — FIyl)rid vigor — Riker mount of parents and Fj^. 



42. Sorghum — Inheritauce of seed color — Riker mount. 



43. Oats — Mendelian inheritance of hull color — Riker mount. 



44. Sna])(lragon — Inheritance of flower color — Riker mount. 

 Econoiutc plants: 45. P>undles of cereal grains (barle}', oats, rice, 



rye, sorghum, wheat). 

 Fungi and plant diseases: 46. Bracket fungi — unmounted. 



Leaves showing leaf-spot diseases (rusts, mildews, and others). 

 47. Unmounted. 48. Mounts covered with cellophane. 

 49. Riker uiount — s])eciniens of six diseases. 

 Mosses and Ferns: MOunts covered with cellophane. 



50. Life history of a moss plant — Folytrichum commune. 

 Angios perms: 



51. Riker mount showing leaf modifications. 



52. Fruits of trees, flowering plants, weeds, lotus pods — loose. 



53. Riker mount to show methods of seed dispersal. 



LIBRARY 



The ra])idly growing library of the Garden comprises at present 

 about 20,500 volvimes and about 17,000 pamphlets. This is not 

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

 sons daily (exce})t Sundays and holidays) from 9 a.m. until 5 p.m. 

 (Saturda\-s, 9 to 12). More than 1,000 periodicals and serial 

 publications devoted to botany and closely related subjects are 

 regularly received. 14iese include the transactions of scientific 

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

 reports, and other ])ul)lications of various departments of the 

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

 ments, and ot all state agricultural ex])eriment stations and agri- 

 cultural colleges; the publications of research la])oratories, uni- 

 versities, botanic gardens, and other scientific institutions of the 



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



wo 



