652 



DATA OF PROPEKTIES OF STARCHES OF PARENT- AND HYBRID-STOCKS. 



The gelatinized grains are as much swollen, have rather 

 thin instead of rather thick capsules, and are more dis- 

 torted than in I. cengialti. 



The reaction with calcium nitrate begins immediately. 

 Complete gelatinization occurs in less than 0.5 per cent 

 of the entire number of grains and 6 per cent of the 

 total starch in 5 minutes; in about 4 per cent of the 

 grains and 41 per cent of the total starch in 15 minutes; 

 in about 13 per cent of the grains and 59 per cent of the 

 total starch in 30 minutes; in about 23 per cent of the 

 grains and C3 per cent of the total starch in 45 minutes ; 

 in about 27 per cent of the grains and 68 per cent of the 

 total starch in 60 minutes. (Chart D 413.) 



The reaction with uranium nitrate begins in a few 

 grains in 30 seconds. Complete gelatinization occurs in 

 less than 0.5 per cent of the entire number of grains and 

 2 per cent of the total starch in 5 minutes ; in less than 

 0.5 per cent of the grains and 10 per cent of the total 

 starch in 15 minutes; in about 3 per cent of the grains 

 and 20 per cent of the total starch in 30 minutes ; in about 

 6 per cent of the grains and 33 per cent of the total starch 

 in 45 minutes; in about 8 per cent of the grains and 

 36 per cent of the total starch in 60 minutes. (Chart 

 D414.) 



The reaction with strontium nitrate begins in a few 

 grains immediately. Complete gelatinization occurs in 

 about 1 per cent of the entire number of grains and 12 

 per cent of the total starch in 5 minutes; in about 24 

 per cent of the grains and 58 per cent of the total starch 

 in 15 minutes; in about 38 per cent of the grains and 

 78 per cent of the total starch in 30 minutes; in about 

 41 per cent of the grains and 74 per cent of the total 

 starch in 45 minutes ; in about 47 per cent of the grains 

 and 86 per cent of the total starch in 60 minutes. 

 (Chart D 415.) 



The reaction with cobalt nitrate begins in rare grains 

 in 1 minute. Complete gelatinization occurs in less than 

 0.5 per cent of the entire number of grains and 1 per cent 

 of the total starch in 5 minutes ; in less than 0.5 per cent 

 of the grains and 2 per cent of the total starch in 15 

 minutes ; in less than 0.5 per cent of the grains and 5 per 

 cent of the total starch in 30 minutes ; in less than 0.5 per 

 cent of the grains and 6 per cent of the total starch in 45 

 minutes ; in about 0.5 per cent of the grains and 7 per 

 cent of the total starch in 60 minutes. (Chart D 416.) 



The reaction with copper nitrate begins in a few 

 grains in 30 seconds. Complete gelatinization occurs in 

 less than 0.5 per cent of the entire number of grains and 

 10 per cent of the total starch in 5 minutes; in about 



1 per cent of the grains and 30 per cent of the total starch 

 in 15 minutes; in about 10 per cent of the grains and 

 50 per cent of the total starch in 30 minutes ; in about 

 18 per cent of the grains and 57 per cent of the total 

 starch in 45 minutes; in about 24 per cent of the grains 

 and 60 per cent of the total starch in 60 minutes. (Chart 

 D417.) 



The reaction with cupric chloride begins in a few 

 grains in 30 seconds. Complete gelatinization occurs in 

 less than 0.5 per cent of the entire number of grains and 



2 per cent of the total starch in 5 minutes; in about 

 1 per cent of the grains and 15 per cent of the total 

 starch in 15 minutes; in about 17 per cent of the grains 

 and 55 per cent of the total starch in 30 minutes; in 

 about 31 per cent of the grains and 62 per cent of the 



total starch in 45 minutes ; in about the same percentage 

 of the grains and 68 per cent of the total starch in 60 

 minutes. (Chart D 418.) 



The reaction with barium chloride begins in a few 

 grains in 1 minute. Complete gelatinization occurs in 

 less than 0.5 per cent of the entire number of grains and 

 total starch in 5 minutes; in about 0.5 per cent of the 

 grains and 1 per cent of the total starch in 15 minutes; 

 in about the same percentage of the grains and 2 per 

 cent of the total starch in 30 minutes ; in the same per- 

 centage of the grains and 3 per cent of the total starch 

 in 45 minutes; in about the same percentage of the grains 

 and 5 per cent of the total starch in 60 minutes. (Chart 

 D419.) 



The reaction with mercuric chloride begins in rare 

 grains in 1 minute. Complete gelatinization occurs in 

 less than 0.5 per cent of the entire number of grains and 

 total starch in 5 minutes; in less than 0.5 per cent of 

 the grains and 2 per cent of the total starch in 15 min- 

 utes; in about 0.5 per cent of the grains and 3 per cent 

 of the total starch in 30 minutes; in about 1 per cent 

 of the gTains and 9 per cent of the total starch in 45 

 minutes ; in about the same percentage of the grains and 

 12 per cent of the total starch in 60 minutes. (Chart 

 D420.) 



Iris dorak (Hybrid). 



(Plate 18, fig. 108; Charts D 400 to D 420.) 

 Histologic Properties. 



In form the grains are usually simple and isolated, 

 but there are more compound grains and more aggregates 

 than in J. iberica, and considerably more than in I. cen- 

 gialti. The aggregates are usually small doublets of 

 equal size, and the compound grains are of the same two 

 types as are described under I. iberica. The grains are 

 more irregular in form than in I. iberica and hence more 

 irregular than in the other parent, and the irregularities 

 are due to the same causes. The small, narrow notch 

 in the middle of the distal margin is, however, much more 

 common than in either parent. The conspicuous forms 

 are : Elliptical with flattened distal end, which is not 

 quite so common as in J. iberica, but more common than 

 in I. cengialti; and ovoid, more common than in I. iber- 

 ica, but less than in I. cengialti. The additional forms 

 are nearly round, triangular with rounded angles, dome- 

 shaped, lenticular, and club-shaped. The grains, as in 

 the parents, are not flattened. In form I. dorak shows 

 a somewhat closer relationship to I. iberica than to 7. 

 cengialti. 



The hilum when not fissured is as distinct as in 7. 

 iberica, and is somewhat more often fissured than in that 

 starch, but not nearly so often as in I. cengialti. When 

 fissures occur they have the following forms : (1) A small, 

 straight, transverse line; (2) a flying-bird; (3) 2 lines 

 at an angle resembling a pair of dividers, and often 

 crossed by a straight, transverse line; (4) rarely, an 

 irregularly stellate arrangement of fissures. The hilum is 

 eccentric 0.3 to 0.15, usually 0.21, which is 0.04 more 

 eccentric than in I. cengialti and 0.06 less eccentric than 

 in I. iberica. In the character of the hilum I. dorak 

 shows a somewhat closer relationship to I. iberica than to 

 7. cengialti, and in the degree of eccentricity to 7. 

 cengialti. 



