56 



lock: studiks in plant brkkdim. 



would probably not be greater than the amount of possible 

 error, in which case the interpretation given may still hold 

 good. Moreover the separation of Nos. 1-13 from Nos. 14 

 onwards is again an arbitrary one. 



Expt. 68. — The male germ cells of the above plants were also 

 examined in bulk by the method of exposing a white strain to 

 their pollen. The result is given in Table 44:— 



No. 



Whit.-. 



Table 44. 



Blue. 



261 

 290 

 209 

 300 

 288 

 190 

 246 

 216 

 267 

 I.-,:: 

 3(»r, 

 241 

 275 

 Ids 



208 

 144 

 205 

 116 

 L66 

 98 

 US 



Total. 



541 



640 



480 



710 



685 



490 



650 



480 



740 



150 



900 



720 



820 



530 



700 



610 



920 



580 



850 



560 



770 



Per cent. 

 Blue 



4S- 



t.V 



43- 



42- 



42- 



38- 



37- 



45- 



36- 



34- 



33- 



33 • 



33 



31 



29- 



23 



22 



20 



is 



17 

 L5 



Total 0,372 



4,454 



13.S26 



337 



Tlw information obtained in this case is however only of a 

 . general kind, since the variation in the percentage of 

 blue grains show o by differenl plants doubtless depends chief- 

 ly upon differences in the "valencj " of white in the various 

 plants of the white denl strain used in this case as seed parent. 



Bimilai results were obtained in plants of quite a different 

 line of anoesl i v 



