524 



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



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

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

 GO minutes. (Chart D 260.) (See footnote, page 516.) 



The hilum and lamellae are both as distinct as in 

 N. poeticus poetarum. Gelatinization begins at the 

 hilum and progresses according to two methods which 

 are very similar to those already described under N. 

 poeticus poetarum. There are more grains in which the 

 second method occurs than the first, and in both methods 

 the fissures are finer and not so extensive, a marginal 

 band which extends all the way around the margin is 

 often formed, and the striation in this band is not so 

 coarse nor so distinct as in N. poeticus poetarum and 

 much less than in N. poeticus omatus. The gelatinized 

 grains are much swollen and have as thin capsules and 

 are as much distorted as in N. poeticus poetarum. N. 

 poeticus herrick shows qualitatively a much closer rela- 

 tionship to N. poeticus poetarum than to N. poeticus 

 omatus. 



The reaction with pyrogallic acid begins in 1 minute. 

 Complete gelatinization occurs in about 0.5 per cent of 

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

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

 and 19 per cent of the total starch in 15 minutes; in 

 about 31 per cent of the grains and 69 per cent of the 

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

 grains and 83 per cent of the total starch in 45 minutes ; 

 in about 53 per cent of the grains and 91 per cent of 

 the total starch in 60 minutes. (Chart D 262.) 



The hilum and the lamella? are as distinct as in 

 N. poeticus poetarum. Celatinization begins ait the 

 hilum and follows the two methods of procedure de- 

 scribed under the parents. The majority of the grains 

 follow closely the method described for a similar num- 

 ber of the grains of N. poeticus poetarum, the main 

 points of difference noted being that the material distal 

 to the hilum was not so much fissured and did not gela- 

 tinize with so much irregular swelling and distortion. A 

 larger minority than in N. poeticus poetarum follows 

 the second method which is very close in most of the 

 grains to that described in N. i^eticus poetarum, and in 

 a few to that recorded in N. poeticus omatus. The 

 gelatinized grains are as much swollen, have as thin cap- 

 sules and are as much distorted as in N. poeticus poe- 

 tarum. N. poeticus herrick shows qualitatively a closer 

 relationship to N. poeticus poetarum than to N. poeti- 

 cus omatus. 



The reaction with nitric acid begins immediately. 

 Complete gelatinization occurs in about 4 per cent of 

 the entire number of grains and 30 per cent of the total 

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

 and 56 per cent of the total starch in 15 minutes; in 

 about 32 per cent of the grains and 69 per cent of the 

 total starch in 30 minutes; in about 39 per cent of the 

 grains and 78 per cent of the total starch in 45 minutes ; 

 in about 43 per cent of the grains and 78 per cent of the 

 total starch in 60 minutes. (Chart D263.) 



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

 lamella? are as distinct as in N. poeticus omatus, and 

 more distinct than in IV. poeticus poetarum. Gelatiniza- 

 tion begins at the hilum as in the parents, and follows 

 two methods of procedure. The majority of the grains 

 are gelatinized very similarly to the method in a like num- 

 ber of the grains of N. poeticus poetarum, except that 



they are not so distinctly fissured and do not swell so 

 irregularly or with so much distortion. A larger minor- 

 ity than in N. poeticus poetarum follows the second 

 method which is very close to that described for the 

 majority of the grains of N. poeticus omatus. The 

 gelatinized grains are much swollen and have as thin 

 capsules but are not so much distorted as in N. poeticus 

 poetarum, but somewhat more swollen and distorted than 

 in N. poeticus omatus. N. poeticus herrick shows quali- 

 tatively a closer relationship to N. poeticus poetarum 

 than to N. poeticus omatus. 



The reaction with sulphuric acid begins immediately. 

 Complete gelatinization occurs in about 82 per cent of the 

 entire number of grains and 98 per cent of the total 

 starch in 2 minutes; in more than 99 per cent of the 

 grains and total starch in 5 minutes. (Chart D 264). 



The hilum as in the parents is distinct and a small 

 bubble is less often formed there than in N. poeticus 

 omatus but more often than in N. poeticus poetarum. 

 The lamella? are as often distinct as in N. poeticus poe- 

 tarum. Gelatinization begins at the hilum and proceeds 

 according to the two methods which are in general the 

 same for the two parents. In the majority of the grains 

 the method is the same as that described for the majority 

 of the grains of N. poeticus poetarum, but there is no 

 apparent separation by fissures of the primary from 

 the secondary starch, or of the secondary into concentric 

 groups of lamella? as in N. poeticus poetarum, and in this 

 respect this starch resembles N. poeticus omatus. In 

 the second method some grains follow that described 

 under N. poeticus omatus, and others that recorded 

 under N. poeticus poetarum. The gelatinized grains 

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

 much distorted as in N. poeticus poetarum. N. poeticus 

 herrick shows qualitatively a somewhat closer relationship 

 to N. poeticus poetarum than to N. poeticus omatus. 



Narcissus poeticus dante (Hybeid). 



(Plate 9, fig. 54; Charts D 259 to D 264.) 

 Histologic Properties. 

 In form the grains are usually simple and isolated, 

 and there are fewer compound grains and aggregates 

 than in either parent or in N. poeticus herrick. The 

 compound grains belong to the three types described 

 under both parents, the greater number to the type in 

 which 2 small, equal-sized grains are adherent and sur- 

 rounded by 4 to 8 common secondary lamella?, and only 

 rare grains to the two other types. The grains are as 

 irregular as in N. poeticus omatus and N. poeticus her- 

 rick, and the irregularities are due to the same causes 

 as were noted in the parents and N. poeticus herrick; 

 and there are more simple grains in which primary 

 and secondary starch formations may be seen than in 

 either N. poeticus omatus or N. poeticus herrick, but 

 somewhat fewer than in N. poeticus poetarum. The 

 conspicuous forms are ovoid, plano-convex, irregularly 

 polygonal, and nearly round. The additional forms are 

 triangular, pyriform, lenticular, elliptical, and irregu- 

 larly clam-shell-shaped. The grains are not flattened. 

 In form N. poeticus dante shows a somewhat closer rela- 

 tionship to N. poeticus omatus than to N. poetinis poe- 

 tarum. It is more round than N. poeticus herrick, and 

 docs not show such a close relationship as the other 

 hybrid to N. poeticus omatus. 



