396 



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



34 per cent of the grains and 68 per cent of the total 

 starch in 60 minutes. (Chart D 14.) 



The reaction with uranium nitrate begins in a few 

 grains in half a minute. Complete gelatinization occurs 

 in about 0.5 per cent of the grains and 5 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 24 per cent of the grains and 52 per cent 

 of the total starch in 30 minutes; in about 24 per cent 

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

 minutes ; in about 28 per cent of the grains and 70 per 

 cent of the total starch in 60 minutes. (Chart D 15.) 



The reaction with strontium nitrate begins imme- 

 diately. Complete gelatinization occurs in about 40 per 

 cent of the grains and 85 per cent of the total starch in 

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

 99 per cent of the total starch in 15 minutes; and in over 

 98 per cent of the grains and over 99 per cent of the 

 total starch in 30 minutes. (Chart D 16.) 



The reaction with cobalt nitrate begins in rare grains 

 in 1 minute. Complete gelatinization occurs in about 

 1 per cent of the entire number of grains and 2 per cent 

 of the total starch in 5 minutes; slight progress in 15 

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

 of the total starch in 30 minutes ; in about 4 per cent 

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

 minutes; in about 7 per cent of the grains and 12 per 

 cent of the total starch in 60 minutes. (Chart D 17.) 

 Fissures appear at the region of the hilum with an irreg- 

 ular arrangement and may extend over the grain, gela- 

 tinization later beginning at the proximal end and 

 proceeding distalward. The process much more closely 

 follows that of A. belladonna than of Brunsvigia joseph- 

 itm, the fissures are not quite so deep and the reaction less 

 rapid, though otherwise about the same as in Brunsdonna 

 sanderw alba, the relationship being much closer between 

 the hybrids than to either parent. 



The reaction with copper nitrate begins in a few 

 grains in half a minute. Complete gelatinization occurs 

 rarely in less than 0.5 per cent of the entire number of 

 grains and 1 per cent of the total starch in 5 minutes. 

 Complete gelatinization occurs in about 10 per cent of the 

 entire number of grains and 18 per cent of the total starch 

 in 15 minutes; in about 14 per cent of the entire num- 

 ber of grains and 21 per cent of the total starch in 30 

 minutes; in about 18 per cent of the grains and 25 per 

 cent of the total starch in 45 minutes; about the same 

 in 60 minutes. (Chart D 18.) Gelatinization in most 



of the grains proceeds from the proximal end as in A. 

 belladonna, but in a few grains the process advances 

 through the mesial portion along the courses of fissures as 

 is more frequently observed in Brunsvigia josephince, 

 though ultimately the proximal end is usually gelatinized 

 before the distal end more frequently than in Brunsvigia 

 Josephine; the fissures are a little less deep and fewer 

 grains follow the method commonly observed in Bruns- 

 vigia josephinw than in Brunsdonna sanderce alba. The 

 reactions indicate a much closer relationship to A. bella- 

 donna than to Brunsvigia josephime; a little less close to 

 Brunsvigia josephinie than is observed in Brunsdonna 

 sanderos alba; but the relationship is much closer to the 

 other hybrid than to either parent. 



The reaction with cupric chloride begins in a few 

 grains in half a minute. Complete gelatinization occurs 

 in a few grains, but less than 0.5 per cent of the entire 

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

 5 minutes; in about 2 per cent of the grains and 4 per 

 cent of the total starch in 15 minutes; in about 2.5 per 

 cent of the grains and 7 per cent of the total starch in 

 30 minutes ; in about 5 per cent of the grains and 9 per 

 cent of the total starch in 45 minutes ; in about 6 per cent 

 of the grains and 12 per cent of the total starch in 60 

 minutes. (Chart D 19.) Irregular fissures form at the 

 region of the hilum and also around the distal margin 

 of some grains; gelatinization then starts at the proximal 

 end and proceeds more rapidly from that end ; the distal 

 end being very resistant; the appearance of fissures is 

 more frequent but the general course of the reaction is 

 the same in most grains affected as in A. belladonna, less 

 varied than in Brunsvigia Josephines, about the same 

 as in Brunsdonna sanderos alba. The reaction indicates 

 a closer relationship to A. belladonna than to Brunsvigia 

 josephinw, and a much closer resemblance to Brunsdonna 

 sanderw alba than to either parent. 



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 grains and total starch in 5 

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

 about 0.5 per cent of the total starch in 15, 30, 45, and 

 60 minutes. (Chart D 20.) 



The reaction with mercuric chloride begins in rare 

 grains in 1 minute. Complete gelatinization occurs in 

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

 cent of the total starch in 5 minutes; very little if any 

 progress is observed in 15, 30, 45, and 60 minutes, 

 respectively. (Chart D 21.) 



2. HIPPEASTRUM. 



This genus includes about 40 species of bulboua 

 plants that are natives of tropical America. They are 

 commonly cultivated under the name Amaryllis. Hy- 

 bridization has been carried on quite largely. 



Starches of three sets of parent-stocks and hybrid- 

 stocks were studied, all of the specimens being closely 

 related garden forms raised by Veitch & Sons, London, 

 England. 



3. Starches of Hippeastrum titan, H. cleonia, and H. titan- 



cleonia. 



4. Starches of H. ossultan, H. pyrrtia, and H. ossultan-pyrrha. 



5. Starches of H. dceones, H. zephyr, and B. daones-zephyr. 



2. STARCHES OF HIPPEASTRUM TITAN, H. CLEONIA, 



AND H. TITAN-CLEONIA. 

 HIPPEASTRUM TITAN (SEED PARENT). 



(Plate 2, fig. 7; Charts D 22 to D 42.) 

 HISTOLOGIC PROPERTIES. 



In form the grains are usually simple and isolated, 

 but a fair number of compound grains are observed, 

 usually consisting of 2 components, but occasionally hav- 

 ing three or more. There are also a few aggregates, 

 which are usually doublets of the same size, or of very 

 unequal size, but triplets and quadruplets linearly 



