694 



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



process of gelatinization is nearly the same as in the 

 parents. The grains are less quickly reacting than in 

 T. potisii, but more than T. crocosmia aurea. The gela- 

 tinized grains are large and somewhat distorted, but 

 retain some of the form of the untreated grain. In this 

 reaction T. crocosma'jlora shows a closer resemblance, 

 qualitatively, to T. crocosmia aurca than to T. pottsii. 

 The three starches resemble one another closely. 



The reaction with potassium sulphocyanate begins 

 immediately. Complete gelatinizatiou occurs in about 

 31 per cent of the entire number of grains and 69 per 

 cent of the total starch in 5 minutes ; in about 62 per 

 cent of the grains and 86 per cent of the total starch in 

 15 minutes; in about 79 per cent of the grains and 93 

 per cent of the total starch in 30 minutes; in about 82 

 per cent of the grains and 95 per cent of the total starch 

 in 45 minutes ; in about 86 per cent of the grains and 

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

 D492.) 



The reaction with potassium sulphide begins in a 

 few grains immediately. Complete gelatinization occurs 

 only in .rare grains, less than 0.5 per cent of the entire 

 number of grains and 1 per cent of the total starch in 5 

 minutes; slight advance in 15 minutes; still in less than 

 0.5 per cent of the grains and 2 per cent of the total 

 starch in 30 minutes; slight advance in 45 minutes; 

 still in less than 0.5 per cent of the grains and 4 per cent 

 of the total starch in 60 minutes. (Chart D493.) 



The reaction with sodium hydroxide begins imme- 

 diately. Complete gelatinization occurs in about 26 per 

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

 5 minutes; in about 42 per cent of the grains and 71 

 per cent of the total starch in 15 minutes ; in about 46 

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

 in 30 minutes; in about 51 per cent of the grains and 

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

 63 per cent of the grains and 91 per cent of the total 

 starch in 60 minutes. (Chart D494.) 



The hilum becomes distinct as in T. pottsii, and the 

 lamella^ are distinct in some grains but not in others, 

 some resembling T. pottsii and others T. crocosmia aurea. 

 Gelatinizatiou begins at the hilum, and in slightly more 

 grains at the hilum and margin simultaneously than in 

 T. crocosmia aurea, but less than in T. pottsii. The 

 process of gelatinization is nearly the same as in T. 

 crocosmia aurea, only somewhat more rapid. The gela- 

 tinized grains are large and somewhat distorted as in 

 both the parents. In this reaction T. crocos in OR flora shows 

 a closer resemblance, qualitatively, to T. crocosmia aurea 

 than to T. pottsii. 



The reaction with sodium sulphide begins imme- 

 diately. Complete gelatinization occurs in about 3 per 

 cent of the entire number of grains and 16 per cent of the 

 total starch in 5 minutes; in about 13 per cent of the 

 grains and 29 per cent of the total starch in 15 minutes; 

 in about 32 per cent of the grains and 42 per cent of the 

 total starch in 30 minutes ; in about 40 per cent of the 

 grains and 60 per cent of the total starch in 45 minutes; 

 in about 52 per cent of the grains and 65 per cent of the 

 total starch in 60 minutes. (Chart D495.) 



The reaction with sodium salicylate begins imme- 

 diately. Complete gelatinization occurs in about 50 

 per cent of the entire number of grains and 60 per cent 

 of the total starch in 5 minutes; in about 92 per cent 



of the grains and 90 per cent of the total starch in 15 

 minutes; in about 97 per cent of the grains and over 99 

 per cent of the total starch in 30 minutes. (Chart 

 D496.) 



The hilum becomes distinct and a bubble is often 

 formed there. The lamellae are not visible. Gelatiniza- 

 tion, which is preceded by a pitted appearance as noted 

 under the two parents, begins at the hilum in a few 

 grains, and at the corners of the distal pressure facets 

 in most of the grains. It progresses in the same way 

 as noted in T. crocosmia aurca. The gelatinized grains 

 are also large and distorted as in that starch. In this 

 reaction T. crocosmce flora shows a closer resemblance, 

 qualitatively, to T. crocosmia aurca than to T. pottsii. 



The reaction with calcium nitrate begins imme- 

 diately. Complete gelatinization occurs in about 0.5 per 

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

 5 minutes; in about 2 per cent of the grains and 11 per 

 cent of the total starch in 15 minutes; in about 5 per 

 cent of the grains and 16 per cent of the total starch in 

 30 minutes; in about 10 per cent of the grains and 23 

 per cent of the total starch in 45 minutes; in about 15 

 per cent of the grains and 31 per cent of the total starch 

 in 60 minutes. (Chart D 497.) 



The reaction with uranium nitrate begins in a few 

 grains in half a minute. Complete gelatinization was 

 not observed in any of the grains and 1 per cent of the 

 tntal starch was gelatinized in 5 minutes; complete gela- 

 tinization occurs in about 2 per cent of the entire num- 

 ber of grains and 6 per cent of the total starch in 15 

 minutes ; in about 4 per cent of the grains and 7 per cent 

 of the total starch in 30 minutes ; slight advance in 

 gelatinization in 45 minutes ; in about 5 per cent of the 

 grains and 8 per cent of the total starch in 60 minutes. 

 (Chart D498.) 



The reaction with strontium nitrate begins imme- 

 diately. Complete gelatinization occurs in about 4 per 

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

 total starch in 5 minutes; in about 16 per cent of the 

 grains and 26 per cent of the total starch in 15 minutes ; 

 in about 25 per cent of the grains and 43 per cent of the 

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

 grains and 51 per cent of the total starch in 45 minutes; 

 in about 40 per cent of the grains and 60 per cent of the 

 total starch in 60 minutes. (Chart D499.) 



The reaction with cobalt nitrate begins in a few 

 grains immediately. Complete gelatinization occurs in 

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

 per cent of the total starch in 5 minutes ; in about 1 per 

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

 15 minutes; in about the same percentage of the grains 

 and 3 per cent of the total starch in 30 minutes ; in about 

 2 per cent of the grains and 4 per cent of the total starch 

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

 and 6 per cent of the total starch in 60 minutes. (Chart 

 D500.) 



The reaction with copper nitrate begins in rare grains 

 immediately. Complete gelatinization occurs in about 1 

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

 of the total starch in 5 minutes; in about 3 per cent of 

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

 utes; in about 3 per cent of the grains and 17 per cent 

 of the total starch in 30 minutes; in about 6 per cent of 



