TEITONIA. 



117 



TABLE A 35. 



has a somewhat lower reactivity. The differences are, 

 on the whole, such as to suggest well-separated species. 



(2) The curves of the hybrid bear varying relation- 

 ships to the parental curves, tending for the most part 

 to intermediateness and toward the curves of the seed 

 parent. 



(3) An early period of marked resistance is rarely 

 observed, but to the contrary the opposite tendency is 

 usually present, so that the percentage of starch gela- 

 tinized during the first 5 minutes is proportionately 

 larger, commonly very much larger, than at any subse- 

 quent 5-minute interval. An early period of resistance is 

 noticeable particularly in the reactions with chromic acid 

 and pyrogaliic acid, while a low degree of resistance is 

 noted particularly in those with hydrochloric acid, potas- 

 sium sulphocyanate, sodium hydroxide, sodium sulphide, 

 and sodium salicylate (T. pottsii and the hybrid). 



(4) The earliest period during the 60 minutes at 

 which the three curves are best separated, and hence 

 the best time for the differentiation of the starches, is 

 variable in relation to the different reagents. Approxi- 

 mately this period occurs at the end of 5 minutes in 

 the reactions with potassium sulphocyanate, sodium sul- 

 phide, and sodium salicylate; at 15 minutes with chloral 

 hydrate, chromic acid, pyrogaliic acid, hydrochloric 

 acid, potassium iodide, sodium hydroxide, calcium ni- 

 trate, uranium nitrate, copper nitrate, cupric chloride, 

 and mercuric chloride; at 30 minutes with nitric acid, 

 potassium hydroxide, strontium nitrate, and cobalt ni- 

 trate ; and at 60 minutes with potassium sulphide. 



EEACTION-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 parent. (Table A 35 and 

 Charts D 484 to D 504.) 



The reactivities of the hybrid are the same as those 

 of the seed parent in the gentian-violet and temperature 

 reactions ; the same as those of the pollen parent in the 

 cobalt-nitrate reaction ; the same as those of both parents 

 in the sulphuric-acid and barium-chloride reactions; in- 

 termediate in those with iodine, chromic acid, pyrogaliic 

 acid, hydrochloric acid, potassium hydroxide, potassium 

 iodide, potassium sulphocyanate, potassium sulphide, so- 

 dium hydroxide, sodium sulphide, sodium salicylate, cal- 

 cium nitrate, uranium nitrate, copper nitrate, cupric 

 chloride, and mercuric chloride (in 14 being closer to the 

 seed parent and in 2 closer to the pollen parent) ; high- 

 est with safranin, nitric acid, and strontium nitrate (in 

 2 being closer to the seed parent and in the other to 

 the pollen parent) ; and lowest with polarization and 

 chloral hydrate, in both being closer to the seed parent. 



The following is a summary of the reaction-intensi- 

 ties : Same as seed parent, 2 ; same as pollen parent, 1 ; 

 same as both parents, 2; intermediate, 17; highest, 3; 

 lowest, 2. 



The pollen parent seems to have had very little in- 

 fluence in determining the characters of the starch of the 

 hybrid. The tendency to intermediateness of the hybrid 

 is exceptionally well marked, and there is very little 

 tendency for the hybrid curve to be higher or lower than 

 the parental curves. 



COMPOSITE CURVES OF REACTION-INTENSITIES. 



This section treats of the composite curves of the 

 reaction-intensities, showing the differentiation of the 

 starches of Tritonia pottsii. T. crocosmia aurea, and 

 T. crocosmceflora. (Chart E35.) 



Among the conspicuous features of the chart are : 

 (1) The usually well-marked separation of the 

 curves of the parents, together with an almost invariably 



