IRIS. 



109 



TABLE A 32. 



curve of the hybrid to either parent or to intermediate- 

 ness. In fact, there is an inclination for the parental 

 curves to be paired in their course and for the hybrid 

 curve to be distinctly above or below the parental curves. 

 In the chromic-acid reactions there is well-marked in- 

 termediateness of the hybrid, and in those with potas- 

 sium, iodine, sodium sulphide, and cupric chloride a 

 transient intermecliateness during the first 5 minutes; 

 but in this group, with the exception of the potassium 

 iodide reaction, the differences in the curves of the three 

 starches are slight and fall within the limits of error of 

 experiment. 



(2) The lower reactivity of 7. cengialti in compari- 

 son with the other parent in the reactions with chloral 

 hydrate and sodium salicylate ; the higher reactivities in 

 those with chromic acid, pyrogallic acid, potassium io- 

 dide, uranium nitrate, strontium nitrate, and copper 

 nitrate ; the same or nearly the same reactivities with 

 hydrochloric acid, potassium hydroxide, potassium sul- 

 phocyanate, sodium hydroxide, sodium sulphide, calcium 

 nitrate, cupric chloride, and mercuric chloride ; and 

 the same reactivities also with nitric acid, sulphuric acid, 

 potassium sulphide, cobalt nitrate, and barium chloride, 

 in which the reactivities of all three starches are the 

 same or practically the same. 



(3) The curves of the hybrid bear varying relations 

 to the parental curves. The absence of sameness in any 

 instance to the seed parent, the almost entire absence of 

 intermediateness of the curve, and the very marked ten- 

 dency to the curve being the highest or lowest of the 

 three are very striking. This low tendency is a most 

 interesting peculiarity considering the very close rela- 

 tionship of the parents, and it recalls the same but even 

 more marked peculiarity of the hybrids of the well- 

 separated parents Amaryllis belladonna and Briinsvigia 

 Josephines. 



(4) In a few reactions there is evidence of an early 

 period of resistance, and this may be noticeable in regard 

 to one or more of three starches in any reaction. This 

 resistance is seen in all three starches in the reactions 

 with chloral hydrate, chromic acid, pyrogallic acid, nitric 

 acid, strontium nitrate, and cupric chloride ; with I. cen- 

 gialti in the sodium-sulphide reaction ; with both parents 

 in that with calcium nitrate; and with the hybrid in 

 that with cupric chloride particularly. 



(5) The earliest period during the 60 minutes at 

 which the three curves are best separated to differentiate 

 the starches varies with the different reagents. Approxi- 

 mately, this period occurs within 5 minutes in the reac- 

 tions with nitric acid, sulphuric acid, potassium hydrox- 

 ide, potassium iodide, potassium sulphocyanate, sodium 

 hydroxide, and sodium salicylate reactions; at 15 min- 

 utes with chloral hydrate, chromic acid, pyrogallic acid, 

 hydrochloric acid, sodium sulphide, calcium nitrate, and 

 strontium nitrate ; at 30 minutes with copper nitrate and 

 cupric chloride; and at 60 minutes with potassium sul- 

 phide, uranium nitrate, cobalt nitrate, barium chloride, 

 and mercuric chloride. In a number of cases the assign- 

 ment is very questionable, so that the classification must 

 be looked upon as having merely a tentative value. 



KEACTION-INTENSITIES OF THE HYBRID. 



This section treats of the reaction-intensities of the 

 hybrid as regards sameness, intermediateness, excess, and 

 deficit in relation to the parents. (Table A 32 and 

 Charts D 421 to D 441.) 



The reactivities of the hybrid are the same as those 

 of the seed parent in no reaction ; the same as those of 

 the pollen parent in that with cobalt nitrate ; the same 

 as those of both parents in those with nitric acid, sul- 

 phuric acid, and barium chloride, in all of which the 



