542 



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



In this reaction N. fiery cross shows qualitatively a 

 closer relationship to N. gloria mundi than to N. poeticus 

 ornatus. 



The reaction with nitric acid begins immediately. 

 Complete gelatinization occurs in about 0.5 per cent of 

 the entire number of grains and 5 per cent of the total 

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

 and 12 per cent of the total starch in 15 minutes ; in about 

 13 per cent of the grains and 30 per cent of the total 

 starch in 30 minutes; in about 23 per cent of the grains 

 and 54 per cent of the total starch in 45 minutes ; in about 

 27 per cent of the grains and 60 per cent of the total 

 starch in 60 minutes. (Chart D 291.) 



The hilum and lamella? are as distinct as in N. gloria 

 mundi. Gelatinization begins at the hilum as in the 

 parents. In most of the grains the method of procedure 

 is that described under N. gloria mundi; but in a mod- 

 erate number it is the same as that in the majority of the 

 grains of N. poeticus ornatus, except that the stria? are 

 not so coarse and the lamellar appearance of the marginal 

 band remains for a long time as in N. gloria mundi. 



The gelatinized grains are much swollen and have 

 as thin capsules and are as distorted as in N. gloria 

 mundi. 



In this reaction N. fiery cross shows qualitatively a 

 closer relationship to N. gloria mundi than to N. poeticus 

 ornatus. 



The reaction with sulphuric acid begins immediately. 

 Complete gelatinization occurs in about 75 per cent of 

 the entire number of grains and 97 per cent of the total 

 starch in 2 minutes; in about 98 per cent of the grains 

 and in more than 99 per cent of the total starch in 5 min- 

 utes. (Chart D 292.) 



The hilum and lamellae are as distinct and a bubble is 

 seen at the hilum as frequently as in N. poeticus ornatus. 

 Gelatinization begins at the hilum and progresses accord- 

 ing to the two methods, both of which have been described 

 under N. poeticus ornatus and one only under N. gloria 

 mundi. The great majority, however, follow very closely 

 the one described under N. gloria mundi, which is also 

 seen with some minor differences in a minority of the 

 grains of N. poeticus ornatus. A rather small minority 

 follows) the method described for the majority of the 

 grains of N. poeticus ornatus. The gelatinized grains 

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

 distorted as in N. gloria mundi. In this reaction N. 

 fiery cross shows qualitatively a closer relationship to 

 N. gloria mundi than to N. poeticus ornatus. 



16. Starches of Narcissus telamonius plenus, 

 1ST. poeticus ornatus, and N". doubloon. 



Starch of N. poeticus ornatus is described on pages 

 515 to 519. 



N. telamonius plenus (Seed Parent). 



(Plate II, fig. 61; Charts D 293 to D 298.) 

 Histologic Pbopebties. 

 In form the grains are usually simple and isolated, 

 but there are a moderate number of aggregates and a 

 somewhat smaller number of compound grains. The 

 compound grains belong to the following three types in 

 their order of frequency of occurrence: (1) 8 or 9 hila 

 in an amorphous-looking mass of starch which is sur- 

 rounded by 1 or 2 common secondary lamellae; (2) a 



doublet in which a small grain has become adherent to 

 the side or distal end of a large grain, both having 

 been inclosed by 2 or 3 common secondary lamella?; (3) 

 2 small equal-sized grains which have become adherent 

 and later surrounded by 7 or 8 common secondary 

 lamellae. The aggregates consist of 2 or 3 grains which 

 may be of equal or unequal size and linearly arranged. 

 There is a great number of simple grains in which a 

 clear division may be seen between the primary deposit 

 and secondary layers of starch. The grains are usually 

 regular in form, and any irregularities which occur are 

 due to the following causes: (1) A few small or large 

 depressions and elevations in the surface and margin; 

 (2) a greater development of one side or of one part of 

 the distal end than the rest; (3) 1 or 2 rather small, 

 pointed or rounded protuberances from the sides or either 

 end. The conspicuous forms are ovoid, elliptical, nearly 

 round, and triangular with rounded base and angles. 

 The additional forms are plano-convex, lenticular, irreg- 

 ularly polygonal, pyriform, and dome-shaped. The 

 grains are not flattened. 



The hilum, when not fissured, is usually a distinct 

 round or, rarely, lenticular spot. It is usually fissured, 

 but not deeply nor extensively, and the fissures have the. 

 following form: (1) A single short, straight, or rarely 

 curved transverse, oblique, or, rarely, longitudinal line 

 which is sometimes branched; (2) a small Y, T, or 

 cruciate figure; (3) a flying-bird figure; (-1) an irregu- 

 larly stellate mass of fissures. The hilum is sometimes 

 centric, but in the great majority of the grains it is 

 eccentric from 0.46 to 0.23, usually 0.33, of the longi- 

 tudinal axis. 



The lamella are moderately distinct, rather coarse, 

 continuous rings which all follow the form of the outline 

 of the grain. In those grains in which there are primary 

 and secondary starch formations, the lamellae are more 

 distinct in the secondary than in the primary part of the 

 grain. The number counted on the larger grains varies 

 from 6 to 12, usually 10. 



In size the grains vary from the smaller which are 

 4 by 4/*, to the larger which are 34 by 44/* and 28 by 

 44*i, in length and breadth. The common sizes are 26 by 

 22/*, 26 by 26/*, and 26 by 28/*. 



Comparison of the histologic characteristics between 

 N. poeticus ornatus and iV. telamonius plenus shows: 



There are not so many aggregates, but the same num- 

 ber of compound grains which belong to the three types 

 described in N. telamonius plenus; but those belonging 

 to the second and third types described under that starch 

 are more numerous than those described under the first 

 type. There are fewer grains in which a primary and a 

 secondary starch formation may be observed. The grains 

 are irregular in form, and the irregularities are due to 

 the first and third causes enumerated in N. telamonius 

 plenus and also to: (1) poorly defined pressure facets; 

 (2) more or less regular, radiating elevations and de- 

 pressions giving a fluted appearance; (3) to 2 notches 

 on either side of the proximal apex. The forms of the 

 grains are much the same in the two starches. 



The hilum is not so distinct, but more often and more 

 deeply and extensively fissured, and the fissures have 

 the same forms and the same order of frequency of occur- 

 rence. The degree of eccentricity is also very nearly the 

 same, but is somewhat more in N. telamonius plenus. 



