IN THE TROPICS : ITI. 



125 



2.— Offspring of Plant No. 1 of Table 18. 



Expt. 48. — White grains gave rise to 32 plants, all of which 

 produced both black and white grains (it was expected that 

 all the plants would yield some black grains), but in every 

 case the proportion of black grains could be seen at a glance 

 to be less than 50 per cent. The four strongest plants gave 

 the following results : — 



Table 22. 



White. 



Black. 



67 

 62 

 55 

 71 



184 

 171 

 155 

 153 



Expt. 49. — Black grains gave rise to 40 plants, all of whicli 

 produced about 50 per cent, of black grains. 8 plants yielded 

 cobs of a fair size.* 



Planl 



1 

 2 



3 

 4 

 5 

 6 



7 

 8 



Black. 



212 

 156 

 168 

 185 

 154 

 155 

 173 

 124 



White. 



186 

 153 

 167 

 171 

 I7H 

 171 

 176 

 140 



Table 23. 



Total. 



Per cent. 

 Black. 



398 

 309 

 335 

 356 

 333 

 326 

 349 

 264 



Per cent. 

 White. 



46-7 



49-8 

 48 Mi 

 53 

 52 

 50 



8 

 4 

 4 

 53-0 



Tot^ I I. .327 



1,343 



2,670 



497 



50-3 



2a.— The offspring of Plant No. 2 of Table 18. 



This gave a closely similar result. 



' Expt. 50. — Offspring of white grains. 



30 plants all produced both black and white grains, the white 

 being in a minority. 



* It may be noted as a curious fact, but one which amounts prob- 

 ably only to a coincidence, that plants 1-4 of table 23 bore exclusively 

 sugary grains, whilst plants 5-8 produced some 49 per cent, of starchy 

 grains. 



