i86 



The Journal of Heredity 



With the possible exception of the 

 relation between striping and white 

 body color, no definite case of linkage 

 has been found. 



Summary 



1. Self fertile strains in the summer 

 squash have been found and a number 

 of pure lines established. 



2. In crosses between these pure 

 types, information as to the inheritance 

 of various plant characters has been 

 gained. 



3. In body color of fruit, white is 

 dominant over yellow and yellow over 

 green. There may be two independent 

 factors for white, and there are evi- 

 dently various modifying factors for 

 color. 



4. Plain (solid or self) color of fruit is 

 dominant over striping in some cases 

 but appears to be recessive in others. 

 A single factor difference is involved. 



5. In fruit surface, wartiness is 

 dominant over smoothness, and may be 

 caused by at least two independent 

 factors, cumulative in their effect. 



6. The "disc" shape of fruit is domi- 

 nant over the "sphere," the main differ- 

 ence being due to a single factor, 

 although one or more other factors 

 may produce minor effects. 



7. In flesh color of fruit, white is 

 usually dominant over cream and 

 salmon, and a single factor difference 

 seems to be involved, but there are 

 apparently several types of flesh color 

 and these may behave differently. 



8. Single blossom end scar tends to 

 be dominant over double, though these 

 characters vary greatly in inheri- 

 tance and seem also to be readily 

 modified by the environment. 



9. Habit of vine and shape and 

 arrangement of leaves are clearly 

 inherited as also are, in the fruit, the 

 number and character of teeth ; type of 

 "border"; furrowing of surface; cer- 

 tain characteristic shapes; size of seed 

 cavity; size, shape, and color of seed; 

 depth of blossom end scar; size of 

 fruit; and yield, together with other 

 characters. The exact manner of 

 inheritance of all these, however, is 

 as yet not clearly established. 



Books Received 



Principles of Social Psychology, by J. M. Williams, the Alfred Knopf Co., New 

 York, 1922. 



Early Civilization, by A. A. Goldenweiser, Alfred Knopf Co., New York, 1922. 



The Home of the Indo-Europeans, by J. Bender, The Princeton University 

 Press, 1922. 



The Glands Regulating Personality, by Louis Berman, the Macmillan Co., New 

 York, 1922. 



Man, The Animal, by W. M. Smallwood, the Macmillan Co., New York, 1922. 



