M.KINE NARCI 



• 



nitric acid and strontium nitrate are very much alike, 

 the most distinct difference being noted in the curves 

 during the first live minutes, yet, while there is a 

 close correspondence in the courses of the curves, there 

 are curious alterations in the relative positions, as for 

 instance, while the curve of N. curvifolia var. fothi 

 major is the lowest and the curve of A', bowdeni inter 

 mediate in the nitric-acid reactions, the curve of the 

 former is next to the lowest and that of the latter the 

 lowest in the strontium-nirate reactions, showing that 

 there are inherent important differences in the relations 

 of these reagents to the starch molecules. Similar dif- 

 ferences are very strikingly presented by certain starches 

 of other genera which show more or less marked differ- 

 ences in the actions of these two reagents. 



(3) Notable variations are shown in the degree of 

 separation of the curves of the live starches iu each of 

 the charts. In the chart for hydrochloric acid all of the 

 curves run closely together, those of .V. crispa and A'. 

 elegans being identical, and those of the other three 

 being almost identical. In the reactions with chloral 

 hydrate the curves of N. curvifolia var. fothergilli major, 

 N. elegans, and N. sarniensis var. corusca major are 

 very nearly the same, but those of A', crispa and X. boiv- 

 deni are well separated from the former and from each 

 other. In the reactions with nitric acid, potassium 

 sulphocyanate, and potassium sulphide all the curves are 

 fairly to well separated. 



(i) In each chart the several curves hear the same 

 position-relationship, there being no crossing of curves, 

 so that if a given curve is the highest at the 5-minute 

 interval it will not fall below another, although there 

 may be dispersion or approximation of the curves during 

 the progress of gelatinization — in the latter case they may 

 become identical. 



(5) The order of position of the five curves varies in 

 the different reactions, as follows, in each case beginning 

 with the highest and proceeding in order to the lowest: 



Chloral hydrate: X. curv. var. futh. niaj., N. elegans, X. tarn. var. 



cor. niaj., N. crispa, N. bowdeni. 

 Nitric acid: N. elegans, N. crispa, N. bowdeni, N. earn. var. cor. 



maj., N. curv. var. foth. maj. 

 Hydrochloric acid: N. crispa, N. elegans, X. curv. var. foth. maj., 



N. bowdeni, N. sarn. var. cor. maj. 

 Potassium sulphocyanate: N. bowdeni, X. crispa, X. elegans, X. sarn. 



var. cor. maj., X. curv. var. fotti. maj. 

 Potassium sulphide: X. crispa, X. earn. var. cor. maj., X. curv. var 



foth. maj., X. bowdeni, X. elegans. 

 Strontium nitrate: X. elegans, X. crispa, X. sarn. var. cor. maj., 



N. curv. var. futh. maj., X. bowdeni. 



The variation-- in relative positions are quite remark- 

 able and are expressions of definite physico-chemical 

 peculiarities of the starch molecules in relation to the 

 reagents. It will be observed that A', curvifolia var. 

 fotlieri/illi major is the highest in the reactions with 

 chloral hydrate, hut the lowest with nitric acid and 

 potassium sulphocyanate; A*, elegans is highest with 

 nitric acid and strontium nitrate, hut the lowest with 

 potassium sulphide; N. bowdeni is the highest with 

 potassium sulphocyanate, but the lowest with chloral 

 hydrate and strontium nitrate, etc. It is of interest 

 to note that while the charts for nitric acid and strontium 

 nitrate bear a very close resemblance, as previously stated. 

 the order of curves is not the same in both. 



(6) In comparing the chart for hydrochloric acid 

 with the a 



curve charts | E LO, E i I, and E L2) it will i» 

 in the latti 



ingly mm i 



very slow gela l."j mini.' 



the curves of A. bowdeni and N. rosea 



major disprop y low. Both ■ tould per- 



haps be brought up a- high !0-minute an-cissa. 



The error is, h ential im, . inas- 



as it does not give rise to err 



ally modify thi irve. 



(?) The h\ all three sets exhibit the tame 



fundamental peculiarities in relation 

 parents, in so far as each hybrid may in 

 be intermediate, higher, lower, or the same as one or the 

 other parent or bol b 



not he foretold from the read ions of the pan i 

 given reagent what the of the hybrid i- likely 



to he. Thehybrids tend to follow one pan 

 the other, m some react. re the 



other, there not being in any one of the thj . uni- 



versal sexual prepotency. In the first set the hybrids 

 hear, on the whole, a closer relationshi] seed 



parent, but in the second and third 'lien 



parents. In the first and se< . in each of which 



there are two hybrids, the hybrids exhi -nces 



between each other in some reactions as i 

 more marked than, the differences between tl i 

 but common!) the byb] i ■ 



rial ly when the parents are close, but there is no rule. 

 As regards the latter, for instance, in the chloral-hj 

 reactions of the first set (Chart 1) 190), the parents are 

 well separated and likewise the two h] 

 ond set (Chart D211), the parents are well separated, 

 but both hybrids are the same and also the same as one 

 parent; and in the third set ((.'hart I) 232) the parents 

 are the same, but the hybrid is well separated from the 

 parents, and so on with other n 



(8) No more striking feature nted 



than thai of the shifting parental n f the 



two hybrids of veral 



eferred to in Section 6 and fully tabulated 



ii Chapter V. 



13. Comparisons of the Starches of N 



POSTICUS ORNATBS, X. POETICUS POETAROM, -V. 

 POETIC1 S HEEEICK, AND X. Pi 



In histologic chara. opic figures, 



reactions with selenite, qualitative reactions with iodine, 

 and qualitative reactions wit 



all four stai .m. in in varyii 



grees of developmei r with certain individualities 



wlueh collective^ in i rve to be characteristic. 



The starch of Narcissus poeticus poetarum in compari- 

 son with that of N. pot ticus ornaius has a larger nu 



rams, mot 

 a single primary grain inclosed in a secondar 

 more irregularity of the gra listinctness of the 



hiluni, mi [ration but 1< - hing, 



and lainellation not so distil. 



tion figure is less often well and the lines are 



more apt to be 1 ! and bent and less often form 



