DOMESTICATED PLANTS — BLAYDES 335 



matured and bore yellow fruits (pi. 11, fig. 41). Descendants from 

 these 3 plants have been carried through 10 generations with the ma- 

 tured fruits of each generation continuing to be yellow. 



Seeds from the red portion of the chimaeral fruit (pi. 11, fig. 40) 

 were also saved and planted. All the progeny bore red fruits. Two 

 lines were selected from these red-fruited plants as sources of seed. 

 Descendants of these two plants have been planted for 10 generations 

 with no segregation of yellow fruits having been observed and no 

 more fruits have been found with yellow sectors. 



Yellow-fruiting plants were cross-pollinated with red-fruiting 

 plants. The hybrid plants (Fi generation) all bore red fruits, as might 

 be anticipated from results upon crossing other varieties of red and 

 yellow tomatoes, illustrating the dominance of the red color factor over 

 yellow color. Seeds were obtained from self-pollinated hybrids and 

 planted. Out of a group of 59 plants, 45 bore red fruits and 14 were 

 yellow-fruited, working out as a simple Mendelian 3: 1 ratio. 



Although no other sectorial chimaera has been reported for fruits 

 from which the mutant character is transmitted by seed, it probably 

 does occur and usually escapes unnoticed. This suggests another plant 

 organ and place in the life cycle worthy of close observations, where 

 mutants may be discovered. 



This story of the domestication of plants is a story of how man has 

 and is now making use of the products of evolution that are desirable 

 to him. The world is represented in our gardens, orchards, and fields 

 by many domesticated plants necessary to our daily activities and well- 

 being. xYchievements have been considerable in the past, and there 

 still remains a great reservoir of unexplored plant potentialities. 



REFERENCES 



Ames, O. 



1939. Economic annuals and human cultures. Botanical Museum of Har- 

 vard University. 

 Anderson, E. 



1952. Plants, man and life. Boston. 

 Anderson, R. E., and Brink, R. A. 



1952. Kernel pattern in variegated pericarp maize and tlie frequency of self- 

 colored offspring. Amer. Journ. Bot., vol. 39, pp. 637-644. 

 Bird, J. B. 



1948. America's oldest farmers. Nat. Hist., vol. 57, pp. 296-303, 334-335. 

 Bryan, K. 



1941. Geologic antiquity of man in America. Science, vol. 93, pp. 505-514. 

 Camp, W. H. 



1947. The world in your garden. Nat. Geogr. Mag., vol. 92, pp. 1-66. 

 Caeteb, G. F. 



1945. Plant geography and culture history in the American Southwest. 

 New York. 



