MOMA 



121 



rote; and they an- more numerous. The tile is larger 

 limn in //. double light rote. In the polariscopic, ele- 

 niti>. ami iodine reactions there are variuu* .Inferences 

 Inch -in t be of a minor character, and the same u 

 true f the reactions with chloral hydrate, i-hroinic acid, 

 I. mtrir acid, ami .-trontium nitrate. The 



i of the hyhnd is closer to that of H. double light 

 rote in tin- form of the K'r"'"*, character of the hilum, 

 rharactcr <>f the lani.-lhc, ami -i/c of the smaller grains, 

 hut nearer to /;. sorotrana in the wivntricity of the 

 hilutn and size of the larger grain*. It is closer to B, 



lujlit ro.it in the appearance with selenite, hut 

 nearer thr other parent in the polariscopic figure*. It in 

 closer to the tir-t |>an-nt in the iodine react long. In the 

 qualitative reaction.- with chloral hy.lr.iti-. chromic acid, 

 pyrogallic acid, nitric acid, and .-trontinm nitrate, while 

 to H. double light rout, the intlui-iuv-. f It. toco- 

 trana art- quite manifest in each. 



Krarttuntttlrxtilirt 



by Ligkt, Color, and Trmpm- 

 tun fraction*. 

 Polarisation: 



B. doub. light roee, moderately high to h.h. value 70. 

 B. Kx-otraoB. moderate to moderately hicb. leat than in B. doubU 



liht nc. value 60. 

 B. -rrripi. moderate to high, intermediate between parent*, value 07. 



B. doub. light roM, moderate, value 45. 



B. aoootrana. light to moderate. Irm than in B. double light roar. 



value SO. 

 B. fnatn. light to modrrate, intermediate betweaa the parrnU. 



value 40. 

 Gentian violet: 



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



B. aoeotrana. light to moderate, lea* than in B. double light roar. 



value 3S. 



B. enaign. light to moderate. IBM than in either parent, value 30. 

 Safranin: 



B. doub. licht roee, moderate to deep, value 00. 

 H. weotraaa, moderate, lea* than in B. double light roee. value AS. 

 B. eongn. moderate to deep, lev than in either parent, value SO. 

 Temperature: 



B. doub. light roee. in the majority at 00 to 61. in all at 03 to 64. 



mean 03*. 

 B. eoeotrana. in the majority at 70 to 80*. in all at 81 to 81.8*. 



mean 81.4*. 

 B. enaign. in the majority at 64 to M-S". in all at 64 to 88. mean 67. 



The reactivity of H. double light rote is higher than 

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

 tivity of the hybrid i<t 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 saf ranin. The hybrid is closer to B. double light rote 

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

 perature reactions, and the reverse in those with gentian 

 violet and saf ran in. 



Table A 37 shows the reaction-intensities in percent- 

 ages of total starch gelatinized at definite interval* (sec- 

 onds and minutes). 



VBLOCITT-REACTIOW CURVES. 



This section treats of the velocity-reaction runes of 

 the starches of Begonia double light rote, B. tocotrana, 

 and H. ensign, showing quantitative differences in the 

 behavior toward different reagents at definite time-inter- 

 vals. (Charts D 527 to D 532.) 



The most conspicuous features of these five charts are : 



The marked diversity of the relations of the three 



-, all three running close in the choral-hydrate 



i ..,, \ n 



reactions, two being close and the other well separated in 

 those with nitric acid and strontium nitrate, two being 

 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 //. double light rote curves to be closely related, 

 and to be higher usually much higher than the curve* 

 of B. tocotrana. The tendency in all of the reaction* 

 to intermediate-lies*, highest or lowest reactivity, with an 

 inclination in 8 out of 1U reactions toward the reactivity 

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

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



RKACTIOX-INTKNSITIEH or THE HYBRID. 



This section treats of the reaction-intensities of the 

 hybrid as regards sameness, intermediateneas, excess, 

 and deficit in relation to the parents. (Table A 37 and 

 Charts D 527 to D 532.) 



The reactivities of the hybrid arc not the same as those 

 of either 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 that 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 seed parent, 0; same as pollen parent, 0; 

 same as both parents, 0; intermediate, 7; 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 or REACTIOX-ISTKXSITIB. 

 This section treats of the composite curves of the 

 reaction-intensities, showing the differentiation of the 



