78 



HISTOLOGIC PROPERTIES AND REACTIONS. 



logic j the starches of the parents differ in cer- 



tain well-defini 5. The starch of Narcissus poeti- 



cus poetarum in comparison with that of the other parenl 



in the polarization figure less definition and 

 differences in the characters of the lines; and in the 

 ite reaction less clean-cul quadrants, more irregu- 

 larity often puril tors, and more 



ih a greenish tinge. With iodine no qualita- 



were recorded. In the qualitative reac- 



igents there arc well-defined 



differences which for the mosl part are related I" varia- 



igic peculiarities of the grains of the 



two plants. The starch of the hybrid in comparison with 



if the parents contains a larger percentage 



und grains than in either parent ; 



more like the starch of X. princess mary as regards 



the absence of clearness of distinction between the pri- 



and secondary starch deposits; but it is, on the 



whole, in closer relationship to the starch of N. poeticus 



ruin. In the character and eccentricity of the 



hiluni and size of the grains the relationship is closer 



to N. princess mary, but in the character of the lamellae 



it. is nearer the other parent. Tn character of the 



. and in the reactions with selenite, 



the n i clo er to N. princess mary. In the 



qualit dine reaction if is closer to N. poeticus 



of the qualitative reactions with the 



(i luding chloral hydrate, chromic 



acid, pyrogallic acid, nitric acid, and sulphuric acid) 



characteristic- i e parents are evident and also 



certain individualities not observed in the parents, but 



of the hybrid, as a whole, arc closer to 



N. princess mary than to N. poeticus poetarum. 



Reaction-int retsed by Light, Color, and Tempera 



ture Reactions. 

 Polarization: 



y, low to high, value 35. 



X- p tar., low to high, hi) her than in N. princess mary, 



valm 



. low to high, same as in N. i icu poetarum, value 40 



Iodine: 



V. princess mary. lc to mo ' rate, value -1-'. 



N. poeticus poetar., linht to moderate, slightly higher than in 



X. princi --■ mar] . value 15. 

 N. cresset, light to moderai le as in X. pi arum, 



value 45. 

 Genti 



N. princess mary. light to moderate, value 37. 



X. poeticus poetar., light to modi rati-, slightly lighter than in 



X. princess mary, value 35. 

 X. en t to moderate, the same as in N. princi mar; 



value 37. 

 am: 

 X. princess mary, moderate, value 50. 

 N. pi tar, moderate, the same as in X. princess mary, 



value 50. 



X. ere lei ime as in both parents, value 50. 



Temperature: 



X. princess mary, in majority at 711 to 72°, in all at 71 to • 



a 75°. 

 X. poeticus poetar., in majority at 07 to 09°, in all at 71 to 7.'i , 



mean 72°. 

 X*. rn-Ksrt. in majority at 71 to 73°, in all at 71.5 to 70". mean 75.7°. 



The Tea of A', princess mary is the same or 



■ ally the same as that of the other parent in the 

 safranin reaction; higher in the gentian-violet reaction: 

 and lower in the polarization, iodine, and temperature 

 reactions. The rea if the hybrid is the same or 



practically tin : of ,V. princess mary with 



an violet: the same or practically the same as that 

 of the other parent in the polarization and iodine reac- 

 tions; the same as that id' both parents with safranin; 

 and the lowesl of ti, .>, ith temperature, I 



N. princess mary. 



Table A li show- the reaction-intensities in percent- 

 age- of total starch gelatinized at definite intervals 

 ( minutes) : 



Table A 17. 



Velocity-reaction Cnt\ 



This section deals with the velocity-reaction curves 

 of the starches of Narcissus princess- mary, A. poeticus 

 poetarum, and N. cresset, showing quantitative differ- 

 ences in the behavior toward different reagents at definite 

 time-intervals. (Charts D 899 to 1» 304.) 



The most conspicuous features of these chart- are: 



(1) The closeness of all three curves in all of the 

 charts (with the exception of the very quick sulphuric- 

 acid reaction in which there is no differentiation ) and the 

 moderate to low or very low reactivities. In the sul- 

 phuric-acid reaction gelatinization proceeds so rapidly 

 that there is differentiation only before the end of about 

 ■'! minutes, at the end of 2 minutes the reactions of A". 

 princess mary and the hybrid are practically absolutely 

 the same, hut the reaction of the other parent is distinctly 

 less. In the reaction with chloral hydrate there is unim- 

 portant separation of the curves, hut in the other three 

 reactions there are varying degrees of separation. 



('■.') The relationships of the parental curves to each 

 other and to the curve "|' the hybrid vary in the different 

 reactions and during the progress of tin 1 reactions. 



(3) The curve id' A. princess mary is the highest in 

 the reaction with pyrogallic acid: lowest with chloral 

 hydrate; intermediate with nitric acid; and practically 

 the same as that of the hybrid and higher than the curve 

 of the other parent with chromic acid. 



(4) The hybrid curve is the highest of the three in 

 the reactions with chloral hydrate and nitric acid; it 

 tends to be the lowesl with pyrogallic acid; and it in- 

 clines to he the lowest at first and the highest later with 

 chromic acid. It is more closely related to the curve of 

 N. princess mary in the reaction with chloral hydrate; 

 to the curve of the other parent with nitric acid; and first 



