CRINUM. 



57 



The reactivities of the hybrid are the same as those 

 of the seed parent in none of the reactions; the same 

 as those of the pollen parent in the reactions with polar- 

 ization, gentian violet, and safranin; the same as those 

 of both parents in none of the reactions; intermediate 

 vrith iodine and sodium salicylate, in one being mid- 

 intermediate and in the other closer to the pollen parent; 

 highest with temperature, chloral hydrate, chromic acid, 

 pyrogallic acid, nitric acid, sulphuric acid, hydrochloric 

 acid, potassium hydroxide, potassium iodide, potassium 

 sulphocyanate, potassium sulphide, sodium hydroxide, 

 sodium sulphide, calcium nitrate, uranium nitrate, 

 strontium nitrate, cobalt nitrate, copper nitrate, cupric 

 chloride, barium chloride, and mercuric chloride (in 19 

 being closer to the pollen parent, and in 2 being as close 

 to one as the other parent) ; and the lowest in no reaction. 



The following is a summary of the reaction-intensi- 

 ties: Same as seed parent, 0; same as pollen parent, 3; 

 same as both parents, 0; intermediate, 2; highest, 21; 

 lowest, 0. 



Intermediateness is almost absent, sameness or incli- 

 nation to the seed parent entirely absent, and highest reac- 

 tivity and sameness or inclination to the pollen parent 

 very conspicuous. C. moorei, the seed parent, not only 

 tends to higher reactivities than the other parent, but 

 also to so markedly raise the reactivities of the hybrid as 

 to bring the latter higher as a rule than its own. The 

 seed parent has obviously had very little iniiuence in 

 determining the properties of the starch of the hybrid. 

 In this set C. longifolium is the seed parent and in the 

 preceding set the pollen parent, and in both it has been 

 comparatively impotent in determining the parental 

 leanings of the hybrid. (See Chapter 5, Section 4.) 



Composite Cuhves of Reaction Intensities. 



This section treats of the composite curves of the 

 reaction-intensities showing the differentiation of the 

 starches of Crinum longifolium, C. moorei, and C. 

 powellii. (Chart E 9.) 



The most conspicuous features of this chart are : 



(1) The relatively remarkably high reactivity of the 

 hybrid. It is higher than in either parent with few ex- 

 ceptions, and in the latter instances it is the same or 

 slightly lower than that of one or the other parent. 



(2) The closeness with which the hybrid and C. 

 moorei curves run through most of the reactions. In 17 

 out of the 26 reactions the hybrid curve is closer to the 

 C. moorei curve. In 7 instances (chromic acid, calcium 

 nitrate, uranium nitrate, cobalt nitrate, copper nitrate, 

 cupric chloride, and mercuric chloride) it is farther 

 separated from the curves of the parent stocks than are 

 the latter separated from each other. The high reac- 

 tivity of the hybrid in comparison with the reactivities 

 of the parent stocks in the reactions with calcium nitrate, 

 uranium nitrate, copper nitrate, cupric chloride, and 

 mercuric chloride is quite remarkable by showing a wide 

 departure from intermediateness. 



(3) In C longifolium the very high reactions with 

 polarization, pyrogallic acid, nitric acid, sulphuric acid, 

 hydrochloric acid, potassium hydroxide, potassium 

 iodide, potassium sulphocyanate, and sodium hydroxide ; 

 the high reactions with gentian violet, safranin, chromic 

 acid, sodium salicylate, and strontium nitrate ; the mod- 

 erate reactions with iodine and sodium sulphide ; the low 

 reactions with chloral hydrate, temperature, potassium 

 sulphide, calcium nitrate, uranium nitrate, cobalt ni- 

 trate, copper nitrate, cupric chloride, and mercuric chlo- 

 ride ; and the very low reaction with barium chloride. 



(4) In C. moorei the very high reactions with polari- 

 zation, pyrogallic acid, nitric acid, sulphuric acid, hydro- 

 chloric acid, potassium hydroxide, potassium iodide. 



