IRIS. 



663 



reaction /. mrs. alan grey shows qualitatively a closer 

 relationship to I. pallida queen of may than to 7. 

 cengialti. 



The reaction with potassium sulphocyanate begins 

 immediately. Complete gelatinization occurs in about 

 28 per cent of the entire number of grains and 66 per 

 cent of the total starch in 2 minutes; in about 31 per 

 cent of the grains and 77 per cent of the total starch 

 in 5 minutes ; in about 47 per cent of the grains and 90 

 per cent of the total starch in 15 minutes; in about 60 

 per cent of the grains and 93 per cent of the total starch 

 in 30 minutes. (Chart D 429.) 



The reaction with potassium sulphide begins in 30 

 seconds. 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 about 1 per cent of the grains and 

 6 per cent of the total starch in 30 minutes ; little if any 

 further advance occurs in 45 and 60 minutes, respec- 

 tively. (Chart D 420.) 



The reaction with sodium hydroxide begins imme- 

 diately. Complete gelatinization occurs in about 18 per 

 cent of the entire number of grains and 45 per cent of 

 the total starch in 2 minutes; in about 29 per cent of 

 the grains and 64 per cent of the total starch in 5 

 minutes ; in about 39 per cent of the grains and 75 per 

 cent of the total starch in 15 minutes; in about 65 per 

 cent of the grains and 90 per cent of the total starch in 

 30 minutes; in about 70 per cent of the grains and 

 93 per cent of the total starch in 45 minutes; in about 

 75 per cent of the grains and 94 per cent of the total 

 starch in 60 minutes. (Chart D431.) 



The hilum and lamella? are as distinct as in I. pallida 

 queen of may. Gelatinization begins at the distal end 

 and progresses as in I. pallida queen of may, with the 

 exception of a few grains in which it begins at the hilum 

 and progresses as in some of the grains of 7. cengialti. 

 The gelatinized grains are as much swollen, have as 

 thick capsules, and are as much distorted as in I. pallida 

 queen of may. In this reaction I. mrs. alan grey shows 

 qualitatively a closer relationship to 7. pallida queen of 

 may than to I. cengialti. 



The reaction with sodium sulphide begins in a few 

 grains immediately. Complete gelatinization occurs in 

 about 1 per cent of the entire number of grains and 7 

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

 cent of the grains and 20 per cent of the total starch in 

 15 minutes; in about 9 per cent of the grains and 31 

 per cent of the total starch in 30 minutes; in about 19 

 per cent of the grains and 40 per cent of the total starch 

 in 45 minutes ; in about 21 per cent of the grains and 52 

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

 D432.) 



The reaction with sodium salicylate begins imme- 

 diately. Complete gelatinization occurs in about 88 per 

 cent of the entire number of grains and 97 per cent of the 

 total starch in 5 minutes; in more than 99 per cent of 

 the grains and total starch in 10 minutes. (Chart 

 D433.) 



The hilum becomes distinct, attended by the forma- 

 tion of a bubble in a smaller majority than in either 

 parent. The lamella? are usually invisible as in 7. pallida 

 queen of may. The grains become more refractive after 



the addition of the reagent, and the first portion of the 

 grain to show this is a rather narrow band of starch at 

 the margin, which is as narrow and as refractive as in 

 7. pallida queen of may. Gelatinization begins at the 

 distal end and progresses as in 7. pallida queen of may 

 in the great majority of the grains. In a rather small 

 minority it progresses as in 7. cengialti. It begins 

 at the proximal end immediately following the distal 

 in as many grains as in 7. cengialti. The gelatinized 

 grains are as much swollen, have rather thick capsules, 

 and are as much distorted as in 7. pallida queen of may. 

 In this reaction 7. mrs. alan grey shows qualitatively a 

 somewhat closer relationship to 7. pallida queen of may 

 than to 7. cengialti. 



The reaction with calcium nitrate begins in a few 

 grains immediately. Complete gelatinization occurs in 

 about 1 per cent of the entire number of grains and 

 10 per cent of the total starch in 5 minutes; in about 11 

 per cent of the grains and 26 per cent of the total starch 

 in 15 minutes; in about 13 per cent of the grains and 

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

 18 per cent of the grains and 48 per cent of the total 

 starch in 45 minutes; in about 20 per cent of the grains 

 and 50 per cent of the total starch in 60 minutes. (Chart 

 D 434.) 



The reaction with uranium nitrate 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 



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

 0.5 per cent of the grains and 7 per cent of the total 

 starch in 15 minutes ; in about 2 per cent of the grains 

 and 12 per cent of the total starch in 30 minutes; in 

 about 6 per cent of the grains and 19 per cent of the 

 total starch in 45 minutes; in about the same percentage 

 of the grains and 24 per cent of the total starch in 60 

 minutes. (Chart D 435.) 



The reaction with strontium nitrate begins in a few 

 grains immediately. Complete gelatinization occurs in 

 less than 0.5 per cent of the entire number of grains 

 and 8 per cent of the total starch in 5 minutes; in 

 about 8 per cent of the entire number of grains and 

 23 per cent of the total starch in 15 minutes; in about 

 14 per cent of the grains and 43 per cent of the total 

 starch in 30 minutes; in about 16 per cent of the grains 

 and 50 per cent of the total starch in 45 minutes ; in 

 about 23 per cent of the grains and 55 per cent of the 

 total starch in 60 minutes. (Chart D 436.) 



Of all the species studied the margin of this species 

 is the most resistant. This holds good with all or nearly 

 all of the reagents. 



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 total 

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

 grains and 0.5 per cent of the total starch in 15 minutes; 

 in less than 0.5 per cent of the grains and 1 per cent 

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

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

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



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

 D437.) 



The reaction with copper nitrate begins in rare grains 

 in 30 seconds. Complete gelatinization occurs in less 

 than 0.5 per cent of the entire number of grains and 



