NERINE. 



67 



TABLE A 12. 



gentian violet, and safranin ; and intermediate reactivity 

 with temperature, but nearer to N. sarniensis var. corusca 

 major. 



Table A 12 shows the reaction-intensities in percent- 

 ages of total starch gelatinized at definite intervals 

 (minutes). 



VELOCITY-REACTION CURVES. 



This section treats of the velocity-reaction curves of 

 the starches of Nerine sarniensis var. corusca major, N. 

 curvifolia var. fothergilli major, and N. glory of sarnia, 

 showing the quantitative differences in the behavior to- 

 ward different reagents at definite time-intervals. 

 (Charts D 232 to D 252.) 



Among the conspicuous features of these charts are : 



(1) The closeness and correspondence of the curves 

 of all three starches, excepting in the reactions with 

 potassium sulphocyanate in which there appears to be a 

 marked disproportionately low reactivity of N. sarniensis 

 var. corusca major, in comparison with N. curvifolia var. 

 fothergilli major, the departure becoming more and more 

 marked during the course of the experiment. It is of 

 importance to note that the reactions of the former and 

 the hybrid are practically absolutely identical. With a 

 slightly stronger solution of the reagent or a longer 

 period of study it is probable that this discrepancy would 

 become markedly less. The extremely rapid or slow 

 reactions of all three starches with pyrogallic acid, sul- 

 phuric acid, potassium hydroxide, potassium iodide, so- 

 dium sulphide, cobalt nitrate, copper nitrate, cupric 

 chloride, barium chloride, and mercuric chloride yield 

 curves that are wholly or practically valueless for satis- 

 factory differential study. 



(2) The curve of N. sarniensis var. corusca major is 

 higher than the curve of the other parent N. curvifolia 

 var. fothergilli major in the reactions with chromic acid, 

 nitric acid, potassium sulphocyanate, potassium sulphide, 

 sodium hydroxide, calcium nitrate, uranium nitrate, and 

 strontium nitrate; and lower in reactions with chloral 

 hydrate, hydrochloric acid, sodium salicylate, but in 

 several the differences are slight. 



(3) The curves of the hybrid bear varying relations 

 to those of the parents. There are marked tendencies 

 to sameness to the pollen parent and to both parents; 

 little tendency to the seed parent; none to be the highest 

 of the three curves ; and a very marked tendency to bo 

 the lowest with equal inclination to each parent. 



(4) An early period of high resistance followed by 

 a rapid to moderate gelatinization is noted only in the 

 experiments with chromic acid and nitric acid, espe- 

 cially in the first, and in the latter only in N. curvifolia 

 var. fothergilli major. 



(5) The earliest period during the GO minutes that is 

 best for the differentiation of the three starches is for 

 chloral hydrate, potassium sulphide, sodium salicylate, 

 and strontium nitrate at the end of 5 minutes ; for nitric 

 acid and hydrochloric acid at 15' minutes; for chromic 

 acid at 30 minutes; and for potassium sulphocyanate, 

 sodium hydroxide, calicum nitrate, and uranium nitrate 

 at GO minutes. With the very slow reactions, including 

 those with pyrogallic acid, sulphuric acid, potassium 

 iodide, sodium sulphide, cobalt nitrate, copper nitrate, 

 cupric chloride, barium chloride, and mercuric chloride, 

 if any differentiation is possible, the longer the period of 

 the reaction the better. 



REACTION-INTENSITIES OP THE HYBRID. 

 This section treats of the reaction-intensities of the 

 hybrid as regards sameness, intermediateness, excess, and 

 deficit in relation to the parent. (Table A 12 and Charts 

 D 232 to D 252.) 



