440 Report of the Department of Horticulture of the 



tion. From observation of the writer, the irregularity of the 

 surface of the tomato is thought to be correlated with the non- 

 development of ovules. This jDostulation is not improbable, as 

 Ewert has found irregularity of certain fruits, as the apple, to 

 be due to the lack of development of seeds in one or more carpels, 

 and many others have noted the correlation of the development 

 of seed and its surrounding tissues — thus, a study of smoothness 

 in some cases may mean a study of sterility. 



The inheritance of color in tomatoes has been carefully studied 

 and so it is now known that the dark red is dominant to the pink 

 and the yellow, and that the pink is dominant to the yellow 

 color — the submerged color in every case being the recessive. 



Thus, to obtain a red fruit, it is necessary to make sure that 

 one parent is red — the other may be red, pink or yellow; to 

 obtain a pink fruit, one parent must be pink and the other parent 

 either pink or yellow ; and to obtain a yellow, only yellow parents 

 can be used. 



'Size is inherited as if it blended into an intermediate condition, 

 and, therefore, one should cross large fruits to obtain large fruits, 

 small fruits to obtain small fruits, and small by large fruits, or 

 medium by medium fruits to obtain medium sized fruits. Size 

 is probably increased to a slight extent by the heterozygous con- 

 dition, but not sufficiently to be of commercial significance. 



Shape, like size, is inherited more or less as an intermediate 

 in appearance, and, therefore, varieties not too divergent from the 

 desired type should always be selected. 



Earliness is slightly increased by crossing, but for the attain- 

 ment of marked differences, one would have to make crosses with 

 early maturing varieties or strains. The inheritance of season in 

 the Fi generation of the tomato is not known, but from its be- 

 havior in other plants, it is probably inherited as an intermediate 

 condition. Caution should be taken while working for earliness, 

 that all the other characters are all right or the attempt to improve 

 in one direction mav be off-set bv a deterioration in another of 

 equal importance. 



