4 BULLETIN 962, U. S. DEPARTMENT OF AGRICULTURE. 
urally in the field, but a much better set can always be obtained by 
thorough artificial pollination. 
SELFED COMPARED WITH CROSSED PROGENIES. 
In the recent investigations made by the Bureau of Plant Industry 
no attempt was made to obtain excessive vigor in the stocks handled. 
& 
a 
; 
Fig. 1.—Pollinating the Easter lily. The parts of the fiower are so large that eyen ihe 
conventional tweezers are dispensed with. 
Some years ago Mr. George W. Oliver, working on this subject under 
departmental auspices, developed some remarkably vigorous prog- 
enies by crossing the two commercial strains, Harrisii and Gigan- 
teum.! Other investigators have obtained similar results by crossing 
1 Oliver, George W. The production of Easter lily bulbs in the United States. U.S. 
Dept. Agr., Bur. Plant Indus. Bul. 120, 24 pp., 4 pls. 1908. 
