536 



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



observed in any grains and 5 per cent of the total starch 

 is gelatinized in 5 minutes ; complete gelatinization occurs 

 in about 2 per cent of the entire number of grains and 

 14 per cent of the total starch in 15 minutes ; in about 3 

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

 in 30 minutes ; in about 6 per cent of the grains and 25 

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

 same percentage of both the grains and total starch in 

 60 minutes. ( Chart D 280. ) 



The reaction with strontium nitrate begins imme- 

 diately. Complete gelatinization occurs in about 8 per 

 cent of the entire number of grains and 25 per cent of 

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

 grains and 67 per cent of the total starch in 15 minutes ; 

 in about 47 per cent of the grains and 75 per cent of the 

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

 grains and 81 per cent of the total starch in 45 minutes; 

 in about 62 per cent of the grains and 83 per cent of the 

 total starch in 60 minutes. (Chart D 281.) 



The reaction with cobalt nitrate begins in rare grains 

 in 1 minute. Complete gelatinization occurs in but rare 

 grains, less than 0.5 per cent, and 1 per cent of the total 

 starch in 5 minutes; in about 0.5 per cent of the grains 

 and 3 per cent of the total starch in 15 minutes; in about 

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

 in 30 minutes; in about 2 per cent of the grains and 



6 per cent of the total starch in 45 minutes ; little if any 

 further progress in 60 minutes. (Chart D 282.) 



The reaction with copper nitrate begins in 1 minute. 

 Complete gelatinization occurs in about 2 per cent of the 

 entire number of grains and 10 per cent of the total 

 starch in 5 minutes ; in about 10 per cent of the grains 

 and 25 per cent of the total starch in 15 minutes; in 

 about 16 per cent of the grains and 36 per cent of the 

 total starch in 30 minutes ; in about the same percentage 

 of the grains and a slight advance in the total starch in 

 45 minutes ; in about the same percentage of the grains 

 and 38 per cent of the total starch in 60 minutes. (Chart 

 D283.) 



The reaction with cupric chloride begins in a few 

 grains immediately. Complete gelatinization occurs in 

 about 1 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 10 per cent of the total starch in 15 minutes ; in about 



7 per cent of the grains and 12 per cent of the total 

 starch in 30 minutes; in about the same percentage of 

 the grains and 16 per cent of the total starch in 45 min- 

 utes; in about 8 per cent of the grains and 19 per cent 

 of the total starch in 60 minutes. (Chart D 284.) 



The reaction with barium chloride begins by a slight 

 gelatinization around the fissures in 2 minutes. Com- 

 plete gelatinization does not occur in any of the grains 

 and the process has begun in but few grains in 5 minutes ; 

 very slight advance in 15 minutes; complete gelatiniza- 

 tion occurs in very rare grains and has advanced very 

 little, about 1 per cent of the total starch gelatinized in 

 30 minutes ; very slight if any advance is found in 45 and 

 60 minutes, respectively. (Chart D 285.) 



The reaction with mercuric chloride begins in a few 

 grains in 30 seconds. 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 5 per cent of the total starch in 15 min- 

 utes; in about 3 per cent of the grains and 10 per cent 

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

 the grains and 11 per cent of the total starch in 45 min- 

 utes; in about 5 per cent of the grains and 12 per cent 

 of the total starch in 60 minutes. (Chart D 286.) 



15. STAECHES OF NARCISSUS GLORIA MUNDI, N. 



POETICUS ORNATUS, AND N. FIERY CKOSS. 



Starch of N. poeticus ornalus is described on pp. 515 

 to 519. 



N". GLORIA MUNDI (SEED PARENT). 



(Plate 10, fig. 58; Charts D 287 to D 292.) 



HISTOLOGIC PROPERTIES. 



In form the grains are usually simple and isolated. 

 There are a few compound grains and a moderate num- 

 ber of small aggregates. The compound grains belong 

 to two types: (1) 2 or 3 small grains adherent and 

 inclosed in 4, 5, or 6 common secondary lamellae so that 

 they are at the proximal end of a large grain; (2) from 

 6 or 8 hila in an amorphous appearing mass of starch 

 which is surrounded by 2 or 3 common secondary lamellae. 

 The aggregates are usually of 2 or 3 small, equal-sized 

 grains linearly arranged, but occasionally consisting of an 

 irregular mass of small grains. There are a few aggre- 

 gates which consist of a compound and a simple grain. 

 Some of the grains show definite primary and secondary 

 starch-formation. The grains are often irregular in form 

 and the irregularities are due to the following causes: 

 (1) One or more large pointed protuberances from the 

 sides and proximal or distal end; (2) shallow, irregular 

 depressions and elevations in the surface and margin ; 

 (3) a bending of the longitudinal or transverse axes of 

 the slender grains; (4). one or more poorly defined pres- 

 sure facets at the distal end of some grains. The con- 

 spicuous forms are lenticular, ovoid, broad, ellipsoidal, 

 irregularly quadrilateral with rounded corners, plano- 

 convex, and triangular with straight or rounded base. 

 The additional forms are nearly round, pyriform, irregu- 

 larly polygonal, dome-shaped, and club-shell-shaped. The 

 grains are not flattened except some of the larger broad 

 forms, and these, when viewed on edge, appear to have 

 a lenticular form. 



The hilum, when not fissured, is a small, round, or 

 lenticular-shaped spot which is not very distinct. It is 

 usually fissured and the fissures have the following 

 forms: (1) T, Y, or cruciate; (2) a small, straight, or 

 curved transverse or longitudinal line; (3) flying-bird 

 shape; (4) and an irregularly stellate group of fissures. 

 The hilum is sometimes centric, but in the great majority 

 of grains is eccentric from 0.42 to 0.27, usually 0.37, 

 of the longitudinal axis. 



The lamellae are usually not distinct, but they can be 

 seen in a moderate number of grains. They are rather 

 coarse, continuous rings which all have in general the 

 form of the outline of the grain. In the grains which 

 have primary and secondary starch-formations clearly 

 visible, the lamella? are seen only in the secondary part. 

 The number of the lamellae can not be determined as the 

 whole number can not be demonstrated on any one grain. 



The grains vary in size from the smaller which are 4 

 by 4/i, to the larger which are 32 by 40/t, in length and 



