508 



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



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

 the grains and 78 per cent of the total starch in 15 min- 

 utes ; in about 62 per cent of the grains and 86 per cent 

 of the total starch in 30 minutes; in about 72 per cent 

 of the grains and 89 per cent of the total starch in 

 45 minutes; in about 75 per cent of the grains and 93 per 

 cent of the total starch in CO minutes. (Chart D 226.) 



The reaction with cobalt nitrate begins in rare grains 

 in 2 minutes. Complete gelatinization occurs in much 

 less than 0.5 per cent of the entire number of grains and 

 total starch in 5 minutes; still in less than 0.5 per cent 

 of both the grains and total starch in 15 minutes; very 

 little progress in 30 minutes; in less than 0.5 per cent 

 of the grains and total starch in 45 minutes; little if 

 any further progress in CO minutes. (Chart D 227.) 



The reaction with copper nitrate begins in a few 

 grains in 2 minutes. Complete gelatinization occiirs in 

 much less than 0.5 per cent of the grains and total starch 

 in 5 minutes ; in less than 0.5 per cent of the grains and 

 total starch in 15 minutes ; in about 0.5 per cent of the 

 grains and 2 per cent of the total starch in 30 minutes; 

 in about 1 per cent of the 'grains and 3 per cent of the 

 total starch in 45 mtnutes ; very little if any advance in 

 GO minutes. (Chart D 228.) 



The reaction with cupric chloride begins in a few 

 grains in 2 minutes. Complete gelatinization occurs in 

 less than 0.5 per cent of the entire number of grains 

 and total starch in 5 minutes; in less than 0.5 per cent 

 of the grains and 1 per cent of the total starch in 15 

 minutes; little if any further advance in 30, 45, and 60 

 minutes, respectively. (Chart D 229.) 



The reaction with barium chloride begins in rare 

 grains in 2 minutes. Complete gelatinization occurs in 

 less than 0.5 per cent of the entire number of grains 

 and total starch in 5 minutes; very slight progress in 15 

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

 starch in 30 minutes; little if any further progress in 

 45 and CO minutes. (Chart D 230.) 



The reaction with mercuric chloride begins in rare 

 grains in 2 minutes. Complete gelatinization occurs in 

 much less than 0.5 per cent of the grains and total starch 

 in 5 minutes; very slight progress in 15 minutes; in 

 less than 0.5 per cent of the entire number of grains and 

 total starch in 30 minutes ; little if any further advance 

 in 45 and 60 minutes. (Chart D 231.) 



12. STARCHES OF NERINE SAKNIENSIS, VAR. COKUSCA 

 MAJOR, N. CURVIFOLIA VAR. FOTHERGILLI MAJOR, 

 AND N. GLORY OF SARNIA. 



Starch of Nerine sarniensis var. corusca major (seed 

 parent) is described on pp. 498 to 501. 



NEKINE CURVIFOLIA VAR. FOTHERGILLI MAJOR (POLLEN 

 PARENT) . 



(Plate 8, figs. 44 and 47; Charts D 232 to D 252.) 



HISTOLOOIC PROPERTIES. 



In form the grains are usually simple and isolated, 

 but compound grains and aggregates are more common 

 and more varied in type than in N. sarniensis var. corusca 

 major. The aggregates are usually doublets but may 

 be 3 or 4 small grains linearly arranged, and occasionally 

 there arc aggregates composed of compound grains. The 

 compound grains are of four types: (1) 2 equal-sized 



grains, each composed of 5 or 6 lamellae inclosed by 

 2 to 4 or 5 common lamellae; (2) 2, 3, or even 4 small 

 grains at the same or at different levels on the proximal 

 end of a large grain composed of 16 to 20 common 

 secondary lamellae; (3) 3 or 4 hila set in a long amor- 

 phous-looking central portion surrounded by 2 or 3 

 common lamella? and forming a long grain whose surface 

 is indented in several places, as if to indicate separation 

 into distinct simple grains; (4) an occasional type such as 

 is described under N. bowdeni in which a small grain 

 has become attached to the margin of a large grain and 

 the two have been inclosed by 2 or more common lamellae. 

 The grains are slightly less regular than in N. sarniensis 

 var. corusca major, and any irregularities are due to the 

 following causes: (1) Secondary sets of lamellae whose 

 longitudinal axes are at angles with the longitudinal axes 

 of the primary sets; (2) rounded protuberances from 

 various parts of the margin, usually the proximal end; 

 (3) a greater development of one part of the distal end or 

 of one side than the rest; (4) depressions and notches in 

 the margin (these occur in only a few grains). The 

 conspicuous forms are elliptical, triangular with curved 

 base, and ovoid; and among the smaller grains, round 

 and nearly round, and elliptical. There are also len- 

 ticular, pyriform, clam-shell-shaped, round, and nearly 

 round among the larger grains. 



The grains of N. curvifolia var. fot'hergilli major are 

 more frequently compound, and of more varied types, 

 they occur in aggregates more frequently, and they are 

 less regular, and are somewhat more slender and pointed, 

 than those of N. sarniensis var. corusca major. 



The hilum is more distinct than in N. sarniensis var. 

 corusca major and is rarely fissured as in those grains; 

 when a fissure occurs, it is either a small, straight or 

 angled, transverse or oblique line, or an irregularly 

 stellate cavity. The hilum is sometimes centric but 

 usually eccentric from 0.46 to 0.19, commonly 0.26, of the 

 longitudinal axis. It is more distinct and more eccen- 

 tric than in N. sarniensis var. corusca major. 



The lamella are more distinct than in N. sarniensis 

 var. corusca major and usually coarse near the hilum and 

 fine throughout the rest of the grains to the distal margin, 

 with the exception of 1 or 2 coarse refractive lamellae 

 which may be placed at about one-half to three-quarters 

 of the distance from the hilum to the distal margin. The 

 number of lamella? counted on the larger grains varies 

 from 18 to 30, usually 24. The lamellae of these grains 

 are more distinct and less numerous than those of N. sar- 

 niensis var. corusca major, and differ from them in that 

 the coarse lamellae are usually grouped near the hilum. 



In size the grains vary from the smaller which are 

 6 by 6/1 and 6 by 4/t, to the larger elongated forms which 

 are 44 by 28/j., and the larger broad forms which are 40 by 

 34/i, rarely 22 by 40/i, in length and breadth. The com- 

 mon sizes are 29 by 18/t and 30 by 24/t. The grains are 

 slightly smaller and more slender than those of N. sar- 

 niensis var. corusca major. 



POLARISCOPIC PROPERTIES. 



The figure is nearly centric to very eccentric, more 

 eccentric than in N. sarniensis var. corusca major. It is 

 as distinct and slightly more clear-cut than in N. sar- 

 niensis var. corusca major. The linos are not so coarse 

 and are somewhat more apt to be bent and bisected than 



