BEGONIA. 



121 



rose; and they are more numerous. The size is 



tlian in /.'. double light rose. In the polariscopic, 

 mi.', and iodine read ions there are vai ious differences 

 which seem to be of a minor character, and the same is 



true i>f ilu' reactions with chloral hydrate, chromic acid, 

 pyrogallic acid, nitric acid, and strontium nitrate. The 

 sianh of the hybrid is closer to thai of />'. double light 

 /■cxc in the form of the grains, character of the hilum, 

 character of the lamellae, and size of the smaller grains, 



hut nearer to B. socotrana in tl ccentricity of the 



hilum and size of the larger grains. It is closer to B. 

 double light rose in the appearance with selenite, but 

 nearer the other parent in the polariscopic figures. It i- 

 closer to U\i~ first parent in the iodine reactions. In the 

 qualitative reactions with chloral hydrate, chromic acid, 

 pyrogallic acid, nitric acid, and strontium nitrate, while 

 closer to />'. double light /-esc, the influences of /•'. soco- 

 trana are quite manifest in each. 



Reaction-intensities Expressed by Light, Color, and Tempera- 

 tun 1 Reactions. 

 Polarization: 



li. doub. light rose, moderately high to high, value 70. 



B. socotrana, moderate to moderately high, less than in B. double 



light rose, value 00. 

 B. ensign, moderate to high, intermediate between parents, value 67. 

 Iodine: 



B. doub. light rose, moderate, value 15. 



B. socotrana, light to moderate, less than in B. double light rose, 



value 30. 

 B. ensign, light to mod. rate, intermediate between the parents, 

 value 40. 

 Gentian violet: 



B. doub. light rose, light to moderate, value 40. 



B. socotrana, light to moderate, less than in B. double light rose, 



value 35. 

 B. ensign, light to moderate, less than in either parent, value 30. 

 Safranin: 



B. doub. light rose, moderate to deep, value 60. 

 I'., socotrana, moderate, less than in B. double light rose, value 55. 

 B. ensign, moderate to deep, less than in either parent, value 50. 

 Temperature: 



B. doub. light rose, in the majority at GO to 61°, in all at 62 to 64 



mean 03°. 

 B. socotrana, in the majority at 7!) to so", in all at 81 to 81.8 . 



mean 81.4°. 

 B. ensign, in the majority at 64 to 05.5°, in all at 60 to GS°, mean 67°. 



The reactivity of B. double light rose is higher than 

 that of the other parent in all five reactions. The reac- 

 tivity of the hybrid is intermediate between those of the 

 parents in the polarization, iodine, and temperature reac- 

 tions, and is the lowest of the three with gentian violet 

 and safranin. The hybrid is closer to B. double light rose 

 than to B. socotrana in the polarization, iodine, and tem- 

 perature reactions, and the reverse in those with gentian 

 \ iolel and safranin. 



Table A. 3 1 ? shows the reaction-intensities in percent- 

 ages of total starch gelatinized at definite intervals (sec- 

 onds and minutes ) . 



VeLOI I CT-KEACTION CURVES. 



This section treats of the velocity-reaction curves of 

 the starches of Hegoiiiu double light rose, I!, socotrana, 

 and />'. ensign, showing quantitative differences in the 

 behavior toward different reagents at definite time-inter- 

 vals. (Charts D 527 to D 532.) 



The most conspicuous feat tires of these five charts are : 



The marked diversity of the relations of the three 



curves, all three running close in the choral-hydrate 



reactions, two being close and the other well separated in 

 those with nitric acid and strontium nitrate, two 

 somewhat close and the other well separated in that with 

 chromic acid, and all three being well separated in that 

 with pyrogallic acid. The tendency in all for the hybrid 

 and H. double light ruse curves to be closely related, 

 and to be higher — usually much higher — than the curves 

 of B. socotrana. The tendency in all of the reactions 

 to intermediateness, highest or lowest reactivity, with an 

 inclination in 8 out of LO reactions toward the rea< tivity 

 of the seed parent. The short period of very high resis- 

 tance of B. socotrana in the chromic-acid reaction. 



Eeaction-intensities of the HvilKID. 



This section treats of the reaction-intensities of the 

 hybrid as regards sameness, intermediateness, excess, 

 and deficit in relation to the parents. (Table A '■'•'. 

 Charts I) :>■!'. to D 532.) 



The reactivities of the hybrid arc no! the same as those 

 of cither or both parents in a single reaction; interme- 

 diate in the reactions with polarization, iodine, tempera- 

 ture, chromic acid, pyrogallic acid, nitric acid, and stron- 

 tium nitrate, in all being closer to those of the seed 

 parent ; highest in that with chloral hydrate, being 

 closer to thai of the seed parent ; and the lowest in those 

 with gentian violet and safranin, in both being closer to 

 the pollen parent. 



The following is a summary of the reaction-intensi- 

 ties: Same as >t'r<\ parent, 0; same as pollen parent, Oj 

 same as both parents, 0; intermediate, .; highest, 1; 

 lowest, 2. 



The following features of the hybrid are particularly 

 conspicuous: The absence of any reaction that is the 

 same as either or both parents; the marked tendency 

 to intermediateness: the occasional tendency to the 

 highest or lowest reactivity ; and the markedly stronger 

 influence of the seed parent on the properties of the 

 starch. 



Composite Curves of Reaction-intensities. 



This section treats of the composite curves of the 

 reaction-intensities, showing the differentiation of the 



