Xll 



Table of Contents 



acters are associated, 171 Mendel's law of inheritance 

 of unit characters (table), 175 results in jp 2 with com- 

 plete dominance in every character-pair (table 1), 176 

 results involving three pairs of characters (trihybrid), 

 177 incomplete dominance, 179 presence and ab- 

 sence hypothesis, 181 examples of mendelian inherit- 

 ance due to the presence and absence of a single unit, 

 181 mendelian inheritance of color, 185 white flowers 

 in F 2 from red x cream, 187 the ratio 9:3:4, 188 

 colored forms from white x white and the 9 : 7 ratio, 

 188 Emerson's experiments with beans, 189 absence 

 factors, 192 mutations resulting from mendelian segre- 

 gation and recombination, 193 mutations which men- 

 delize are constant, 193 mendelism in wheats 194 

 mendelism summarized, 200 application to plant- 

 breeding, 202 the probable limits of mendelism in the 

 production of new varieties, 204 conclusion, 208. 



CHAPTER VIII 



How DOMESTIC VARIETIES ORIGINATE . . . . 

 Indeterminate varieties, 209 plant-breeding, 212 

 plant-breeding by selection, 218 rules for breeding 

 plants, 222 specific examples, 253 the dewberry and 

 blackberry, 253 the apple, 255 beans, 260 cannas, 

 265 the cabbage family, 267 the chrysanthemum, 267. 



CHAPTER IX 



POLLINATION : OR How TO CROSS PLANTS .... 

 The structure of the flower, 270 manipulating the 

 flowers, 281. 



CHAPTER X 

 THE FORWARD MOVEMENT IN PLANT-BREEDING . 



Systematic improvement of plants, 295 the plant- 

 breeder should aim toward definite ideals, 297 plant 



209-269 



270-293 



294-323 



