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Stems: Twigs to show buds and leaf scars; preserved Corn stems. 
Seeds: For study of root hairs and germination—Castor bean, 
Garden bean, Lupine, Peas, Oats, Corn, Sorghum, Wheat. 
Stem cuttings: Tradescantia, Begonia, Coleus, Geranium, English 
ivy, Willow. 
Genetics material: Sorghum seeds for growing F, seedlings show- 
ing red and green seedling stem characteristics with 3:1 ratios. 
Sorghum seeds giving normal and albino 3:1 ratios. Pea seeds 
of tall and dwarf strains. Seedlings of any of the above. 
Livinc MATERIAL—ANIMALS 
Protozoa: Cultures of Paramecia, Euglena. 
STERILIZED AGAR 
Petri dishes, test tubes, or flasks, sent in clean and dry, one 
week in advance, will be filled with sterile nutrient agar, or with 
potato dextrose agar for the study of bacteria and molds. 
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SPECIMENS AND Mounts For EXHIBIT 
Illustrating the principles of genetics: 
Pea seeds illustrating a dihybrid ratio (wrinkled, smooth, yel- 
low, green )—Riker mounts or vials. 
Jimson weed (Datura)—Mount to show F, 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—lInheritance of hull color—Riker mount. 
BUREAU OF PUBLIC INFORMATION 
Consultation and advice, and the facilities of the library and 
herbarium are freely at the service of members of the Botanic 
Garden and (to a limited extent) of others with special problems 
relating to plants or plant products, especially in the following 
subjects : 
