NARCISSUS. 



85 



The reactivity of -V. > is the same 



or practically the same as that of the other parent in 

 the polarization reaction; higher in the iodine and tem 

 peral are reactions , and low* r in I hi I and 



safranin reactions. The reactivit) of the hybrid is the 

 same or practically the same as thai of 

 fit li<, n m the iodine reaction; intermediate between 

 those of the parents with gentian violet and safranin; 

 : of the three iii the temperature reaction; and the 

 highest of I he three in the p on. 



Table A\'l shows the reaction-intei i percent- 



of total starch gelatinized at definite intervals 

 (minutes) : 



Table A 21. 



Velocity-reaction Curves. 



This section treats of the velocity-reaction curves of 

 the starches of Narcissus weardale perfection, N. ma- 

 de graaff, and .V. pyramus, showing the quantita- 

 tive differences in the behavior toward different reagents 

 at definite time-intervals. (Charts D 323 to D 328.) 



The most conspicuous features of these charts are: 



(1) The clo.-e correspondence of the curves in each 

 of the reactions during their progress (the curves of the 

 Bulphuric-acid reacti m are identical, owing to the ex- 

 tremely rapid reaction), and £he tendency of the reac- 

 tions to he moderate to low. 



(2) The varying relations of the parental curves to 

 each other and the hybrid in the different reactions and 

 (excepting with sulphuric acid) during the progress of 

 the reactions. 



(3) The curve of N. weardale perfection is lower 

 than the curve of the other parent in the chloral-hydrate 

 reaction; higher in those of chromic acid, pyrogallic 

 acid, and nitric acid ; and the same in that of sulphuric 

 acid. In all except the latter they are sufficiently well 



ited for positive differentiation. 

 ( 1) The curve of the hybrid is the lowest of the 

 in the reaction with chloral hydrate; and the 

 highest with chromic acid, pyrogallic acid, and nitric 

 acid. The relationship is closer to N. weardale perfec- 

 tion in the chloral -hydrate reaction; and to this parent 

 at first and to the other parent later in the reactions 

 with chromic acid, pyrogallic acid, and nitric acid. On 



the whole, howi relationship is distinctly closer 



to N. a eardale /» rfei tion. 



(5) A tendency rly period of resistance fol- 



lowed by comparal ivelj rap ''--I in the 



•.', ith i hromic acid llic a, id, with 



suggested resi 



inii : which the three curves are 



i - eparated for differential purposes i- in the sul- 

 phuric-acid reaction at the very beginning of the 

 lion ; in tie us with ch 



and nitric acid a; !.'■ minutes; and in the chloral-hydrate 

 reaction at 60 minute., or probably quite as 

 1 .'> minute 



Bl \< I [ON fNTl -II II.- oi THE 11'. null). 



This section ire.it- of the reaction-intei the 



hybrid a- regards sameness, intermediateness, e 

 and deficit in relation to the parents. (Table A 2] 

 (hart- |i 323 to D 328.) 



The reactivities of the hybrid are the same as those 

 of the seed parent in the iodine reaction; the Bame as 



those of the pollen parent in nolle; the .-mile as 



of both parents in tie- sulphuric a tion, in which 



the reactions occur too rapidly lor differentiation; ii 

 mediate in the reactions with gentian violet and safn 

 in both being closer to tho e of the pollen parent; high- 

 est in the reactions with polarizat tnicacid, pyro- 

 gallic acid, and nitric acid, in oi >se to one 

 as t" the other parent, and in three 

 parent; and lowest with temperature and chloral hydrate, 

 in both being closer to the pollen parent. 



The following is a summary of the reaction-intei 

 tics (10 reactions) : Same as seed parent, 1 ; same as 

 pollen parent, 0; same as both parents, 1 : intermediate, 

 '.' ; highest, 4; lowest, '.'. 



The seed parent exercises a distinctly more marked 

 influence than the other parent in determining the char- 

 acters of the starch of the hybrid. The almost entire 

 absence of sameness to one or the other parent ami tho 

 tendency, on the other hand, to highest and low 

 tivities are conspicuous features of the reactions of the 

 hybrid. 



Composite Curves op Reaction-intensities. 



This section treats of the composite curves of the 

 reaction-intensities, showing the differentiation of the 

 starches of Narcissus weardale perfection, X. madame 

 de graaff, and A', pyramus. (Chart B 21.) 



The most conspicuous features of this , hart arc: 



(1) The close correspondence of all three curves 

 both as to course and nearness, the only well-marked 

 tendency to are being in tin- chromic-acid reaction 

 in which all three curves tend to be well separated. 



(2) In A', wear da with 

 the other parent the higher • - with iodine, tem- 

 perature, chromic acid, pyrogallic acid, and nitric acid; 

 the lower reactions with gentian violet, safranin. ami 

 chloral hydrate: and the same or practically the same 

 reactions with polarization and sulphu 



(3) In A', weardale perfection the very high sul- 

 phuric-acid reaction; the high chromic-acid 



the moderate reactions with iodine, safranin, and pyro- 

 gallic aeid ; the low reactions with polarization, gentian 



