WHITE: INHERITANCE STUDIES ON CASTOR BEANS 521 



EXPLANATION OF PLATES XXIII-XXVIII 



Plate XXIII is a microphotograph of a highly magnified portion of leaf 

 epidermis of the mahogany type showing the red pigment pattern. 



Plate XXIV illustrates the various stem colors. Fig. A is red blush and 

 green bloom; Fig. B is green; Fig. C is red blush and green without bloom; Fig. D 

 is mahogany red or dark red-purple with bloom; Fig. E is mahogany or dark red 

 without bloom; Fig. F is rose or carmine red. 



Plate XXV illustrates inheritance of seed dimension. .1. The ovule or 

 maternal parent is represented by 30 seeds, each seed representing a random selected 

 sample from a single plant, showing the degree of variation in seed dimension within 

 the variety. B. 30 seeds selected at random from a single plant of the maternal 

 parent variety, showing the degree of variation in seed dimension on the same plant. 

 C. 6 seeds representing 6 plants of the paternal parent. D. Fi progeny. Each F| 

 seed is a random selected sample from a single plant, illustrating the uniformity in 

 seed dimension of the Fi progeny. E. Three F2 families are shown, each separated 

 by a white line. Each F2 segregate represented by a single random selected seed. 



Plate XXVI illustrates inheritance of seed dimension and coarse and fine 

 pattern. A. Maternal parent. B. Seed similar to paternal parent in size, seed 

 coat pattern and in seed shape. C. Fi progeny. Note the uniform appearance 

 both as to size and pattern in the Fi progeny. D. F2 progeny Only one F2 family 

 is represented. The coarse and fine pattern segregates are arranged in a separate 

 series. 



Plate XXVII. A series of crosses illustrating inheritance of seed dimension, 

 pattern and seed shape. The different crosses are separated by a white line. Each 

 seed was selected at random and represents a single plant. Only part of the F2 

 progeny of these families are shown, as the large-seeded segregates did not mature. 

 In all these crosses excepting cross no. 4 (from the top), the maternal parent is 

 placed on the left, the paternal on the right, and the Fi generation between them in 

 one row, while the row or rows below represent the Fo progeny. In cross no. 4, the 

 group of 7 beans on the left is all that matured ot an F2 progeny, the F2 parent and 

 two grandparents of which are in the same row and arranged as mentioned above, 

 the ovule parent on the left, etc. In some of the F2 populations, attempts to classify 

 the beans as to shape have been made. 



Plate XXVIII. .4 . Two leaf types. Varieties with the crinkled, notched type 

 being much more ornamental than the other. B. Loose and compact forms of fruit- 

 ing spikes. The compact form associated with certain other characteristics in a 

 variety means greater productiveness. 



