H^MANTHUS. 



445 



most resistant ; a fissure passing through the hilum as 

 the bubble is expelled often precedes gelatiimatioii of 

 this mesial mass of starch. 



The gelatinized grains are swollen and distorted, and 

 either partial or complete solution of the grain may fol- 

 low gelatinizatiou as noted in //. katherintz. 



The reaction with calcium nitrate begins in some 

 of the grains immediately. Complete gelatinization 

 occurs in about 34 per cent of the entire number of grains 

 and 50 per cent of the total starch iu 5 minutes; in 

 about the same percentage of grains and 57 per cent 

 of the total starch in 15 minutes ; in about the same 

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

 30 minutes; in about 38 per cent of the grains and 62 per 

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

 same percentage of each in 60 minutes. (Chart U 119.) 



The reaction with uranium nitrate begins imme- 

 diately. Complete gelatinization occurs in about 22 per 

 cent of the entire number of grains and 26 per cent of 

 the total starch in 5 minutes; in about 26 per cent of 

 the grains and 30 per cent of the total starch in 15 min- 

 utes; in about 32 per cent of the grains and 35 per cent 

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

 centage of each in 45 and 60 minutes, respectively. 

 (Chart D 120.) 



The reaction with strontium nitrate begins imme- 

 diately. Complete gelatinization occurs in about 28 per 

 cent of the entire number of grains and 44 per cent of 

 the total starch in 5 minutes ; in about 30 per cent of the 

 grains and 50 per cent of the total starch in 15 min- 

 utes ; in about 42 per cent of the grains and 60 per cent 

 of the total starch in 30 minutes; in about 46 per cent 

 of the grains and 68 per cent of the total starch in 45 

 minutes; and in about 60 per cent of the grains and 78 

 per cent of the total starch in 60 minutes. (Chart D 121.) 



The reaction with cobalt nitrate begins immediately. 

 Complete gelatinization occurs in about 1 per cent of the 

 entire number of grains and 4 per cent of the total starch 

 in 5 minutes; in about 2 per cent of the grains and 7 

 per cent of the total starch in 15 minutes; in about 4 per 

 cent of the grains and 10 per cent of the total starch in 

 30 minutes ; in about 6 per cent of the grains and 12 per 

 cent of the total starch in 45 minutes; in about 8 per 

 cent of the grains and 14 per cent of the total starch in 

 60 minutes. (Chart D 122.) 



The reaction with copper nitrate begins immediately. 

 Complete gelatinization begins in about 5 per cent of the 

 entire number of grains and 11 per cent of the total starch 

 in 5 minutes ; in about 6 per cent of the grains and 14 

 per cent of the total starch in 15 minutes; in about 9 per 

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

 30 minutes; in about 11 per cent of the grains and 16 

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

 16 per cent of the grains and 24 per cent of the total 

 starch in 60 minutes. (Chart D 123.) Gelatinizatiou 

 proceeds rapidly through the mesial portion of the grain, 

 the entire border being the most resistant; this grad- 

 ually becomes gelatinized, when complete gelatinization 

 occurs. 



The reaction with cupric chloride begins immediately. 

 Complete gelatinization occurs in about 16 per cent of 

 the entire "number of grains and 37 per cent of the total 

 starch in 5 minutes; in about 28 per cent of the grains 



and 53 per cent of the total starch in 15 minutes ; slight 

 progress in 30 minutes; in about 31 per cent of the 

 grains and 56 per cent of the total starch in 45 minutes; 

 in about 37 per cent of the grains and 59 per cent of 

 the total starch in 60 minutes. (Chart D 124.) 



Gelatinization proceeds rapidly through the mesial 

 portion, well-delined lissuivs not being observed in the 

 grains more quickly gelatinized. The entire margin is 

 the more resistant for a short period, but finally in many 

 grains the distal margin is more quickly gelatinized than 

 the interior. The much more rapid gelatinization of the 

 distal margin than of the inclosed portion, with extension 

 of the capsule, was not observed in this starch, as was 

 noted in some grains of H. katherince. 



The reaction with barium chloride begins in rare 

 grains immediately. Complete gelatinization occurs in 

 about 1 per cent of the entire number of grains and 1.5 

 per cent of the total starch in 5 minutes; in about 1.5 

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

 in 15 minutes; in about 2 per cent of the grains and 6 

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

 the same percentage of each in 45 and 60 minutes, respec- 

 tively. ( Chart D 125.) 



The reaction with mercuric chloride begins imme- 

 diately. Complete gelatinization occurs in about 3 per 

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

 the total starch in 5 minutes; in about 5.5 per cent of 

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

 utes; in about 9 per cent of the grains and 17 per cent 

 of the total starch in 30 minutes ; in about 17 per cent 

 of the grains and 20 per cent of the total starch iu 45 

 minutes; little if any further progress or about 22 per 

 cent of the total starch in 60 minutes. (Chart D 126.) 



ILffiMANTHUS KONIG ALBERT (HYBRID). 



(Plate 4, fig. 21; Charts D 106 to D 126.) 



HISTOLOQIC PROPERTIES. 



In form the majority of the grains are simple and 

 isolated. Many occur in aggregates of from 2 to 20 or 

 more components, most frequently from 2 to 9. Pres- 

 sure facets are present on many of the grains. Com- 

 pound grains are often noted, the number of components 

 varying from 2 to at least 20, commonly of the former 

 number. The grains are very irregular and vary much 

 in shape, more so than in either parent. The irregu- 

 larities are due chiefly to the same causes as noted under 

 II. katherince and H. puniceus, but one or more well- 

 marked depressions are frequently found on the surface 

 of the grain, absent in //. katherince but present in H. 

 puniceus; and the protuberances and secondary sets of 

 lamella? are not so frequently observed as in //. katherince, 

 but about the same as in H. puniceus. The arrangements 

 of the components of the aggregates are even more varied 

 than in H. puniceus. In addition to those of linear 

 arrangement noted for this species, T-shaped, boot- 

 shaped, and sickle-shaped forms were observed. The 

 conspicuous forms among the isolated grains are the 

 same as those noted under //. kathcrince and H. puniceus; 

 the lenticular forms are very rare; and the T-shaped, 

 boot-shaped, club-shaped, and napiform grains proved in 

 many instances to be aggregates. Such forms seen in 

 II. kathcrina! might also have been found to be aggre- 

 gates had it not proved impossible to satisfactorily clem- 



