172 



BREEDING CROP PLANTS 



normal varieties but invariably blossomed under field conditions 

 in practically the same period as ordinary varieties of N. tabacum. 



FIG. 39. Front row in twelve-quart buckets exposed to light from 9 a.m. 

 to 4 p.m. or 7 hours daily. Rear row in twelve-quart buckets exposed to light 

 from 6 a.m. to 6 p.m. or 12 hours daily. Note that latter are larger plants but 

 flowered considerably later than the former. (Courtesy of Garner.) 



A total of 1820 F% plants was grown and 439 were of the giant 

 habit. 



