534 



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



starch in 5 minutes; in about 22 per cent of the grains 

 and 28 per cent of the total starch in 15 minutes; in about 

 46 per cent of the grains and 50 per cent of the total 

 starch in 30 minutes ; in about 48 per cent of the grains 

 and 53 per cent of the total starch in 45 minutes; in 

 about 52 per cent of the grains and 56 per cent of the 

 total starch in 60 minutes. (Chart D 265.) 



In a smaller majority of the grains than in N. tazetta 

 grand monarque a small bubble is formed at the hilum 

 and the lamellae are never more distinct than in that 

 starch. The grains become refractive in appearance after 

 the reagent is added and the first part to show this in- 

 creased refractivity is a rather narrow band of material 

 about the margin, which is as narrow and refractive 

 as in N. tazetta grand monarque. Gelatinization in both 

 parents begins at the ends of protuberances or at various 

 discrete points on the distal margin and progresses ac- 

 cording to two methods which are very close to the 

 two described under N. tazetta grand monarque for the 

 more resistant and the lenticular-shaped grains. The 

 main points of difference noted, being that in the first 

 method, there are not so many grains in which serial 

 separation and gelatinization of the distal lamellae take 

 place, and gelatinization proceeds with less fissuring 

 and separation of particles from the ungelatinized ma- 

 terial. The second method in the lenticular grains is the 

 same as in both parents. The gelatinized grains are as 

 much swollen, have as thick capsules, and are as much 

 distorted as in N. tazetta grand monarque. N. poetaz 

 triumph shows qualitatively a closer relationship to N. 

 tazetta grand monarque than to N. poeticus ornatus. 



The reaction with chromic acid begins in 1 minute. 

 Complete gelatinization occurs in less than 0.5 per cent 

 of the entire number of grains and 13 per cent of the 

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

 grains and 75 per cent of the total starch in 15 minutes ; 

 in about 45 per cent of the grains and 90 per cent of the 

 total starch in 30 minutes; in about 65 per cent of the 

 grains and 97 per cent of the total starch in 45 minutes; 

 in about 88 per cent of the grains and 99 per cent of the 

 total starch in 60 minutes. (Chart D 266.) (See foot- 

 note, page 516.) 



The hilum and lamellae are as distinct as in N. tazetta 

 grand monarque. Gelatinization begins at the hilum 

 and progresses in general according to the two methods 

 described under N. tazetta grand monarque. A small 

 majority, less even than in N. tazetta grand monarque, 

 follows the method described for a small majority of the 

 grains of that starch, and the main differences noted are 

 that the material around the hilum is more often divided 

 into granules, and the striae dividing the unfissured 

 material are coarser in these two respects showing a 

 resemblance to N. poeticus ornatus. In the second 

 method, which is not seen at all in 2V. poeticus ornatus, 

 the only points of difference are that the stria? which 

 divide the material at the proximal end are coarser 

 and the granules into which the distal material is divided 

 are not so fine and are more distinct. The gelatinized 

 grains are as much swollen, have as thick capsules, and 

 are no more distorted than in N. tazetta grand monarque. 



In the reaction with chromic acid N. poelaz triumph 

 shows qualitatively a closer relationship to N. tazetta 

 grand monarque than to N. poeticus ornatus. 



The reaction with pyrogallic acid begins in a few 

 grains in 1 minute. Complete gelatinization was not 

 observed in any of the grains and of only 3 per cent of the 

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

 number of grains and 25 per cent of the total starch in 

 15 minutes; in about 27 per cent of the grains and 75 

 per cent of the total starch in 30 minutes ; in about 41 per 

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

 45 minutes ; in about 58 per cent of the grains and 95 per 

 cent of the total starch in 60 minutes. (Chart D 267.) 



The hilum is as distinct as in both parents, and the 

 lamella? are as distinct as in N. tazetta grand monarque. 

 Gelatinization begins at the hilum and progresses accord- 

 ing to the two methods, which are in general the same 

 in both parents. In the first method, which is seen in a 

 smaller proportion of the grains than in N. tazetta 

 grand monarque, the chief difference is that there are 

 more grains in which the material around the hilum is 

 broken up into large particles which are more resistant 

 than the rest of the grain, not so many, however, as in 

 N. poeticus ornatus. In the second method which is seen 

 in a large minority of the grains there are no marked 

 differences between the hybrid and N. tazetta grand 

 monarque. 



The gelatinized grains are as much swollen, have 

 as thin capsules, and are as much distorted as in N. 

 tazetta grand monarque. N. poetaz triumph shows 

 qualitatively a somewhat closer relationship to N. tazetta 

 grand monarque than to N. poeticus ornatus. 



The reaction with nitric acid begins 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 28 per cent of the grains 

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

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

 total starch in 30 minutes; in about 54 per cent of the 

 grains and 86 per cent of the total starch in 45 minutes ; 

 in about 62 per cent of the grains and 88 per cent of the 

 total starch in 60 minutes. (Chart D 269. ) v 



The hilum is as distinct as in the parents, and the 

 lamellae are as distinct as in N. tazetta grand monarque, 

 and are later obscured only to appear again in some 

 grains as in that starch. Gelatinization begins at the 

 hilum and follows two methods of procedure as in the 

 parents, but they are closer to the methods described 

 under N. tazetta grand monarque than those recorded 

 under N. poeticus ornatus, except that in the first method 

 in which gelatinization occurred evenly in all directions 

 from the hilum, there are more in which a primary and 

 secondary starch formation may be seen, with the conse- 

 quent deposit of resistant particles from the primary 

 starch, but there are not so many of these as in N. poeticus 

 ornatus. In the second method described in which two 

 furrows or fissures extend transversely or obliquely from 

 the hilum to the margin, there are somewhat fewer gran- 

 ules found, and these are not so fine as in N. tazetta 

 grand monarque. 



The gelatinized grains are as much swollen and have 

 as thick capsules and are as much distorted as in N. 

 tazetta grand monarque. N. poetaz triumph shows 

 qualitatively a somewhat closer relationship to N. tazetta 

 grand monarque than to N. poeticus ornatus. 



