NARCISSUS. 



sulphuric acid, there are differences of minor charac- 

 Tlic starch of the hyhrid has more isolate.! mul uiurr 

 .-imple grains than cither parent, and in form it is more 

 v related, on the whulf. tu .Y. . m//rr>.< than to .Y. 

 albicans; moreover, some characteristics of the former 

 arc accentuated. The liiluin is less fissured than in 

 either pan-nt, and in both character and eccentricity of 

 the h'.luiii it is in closer relationship to N. albican.' hi 

 the character and number of the lamellae the relation- 

 ship is closer to N. albicans, but in size the relationship 

 is closer to ff. empress. In the character of the polari- 

 scopic figure and appearance with selenite the relation- 

 ship is closer to X. empress. In the qualitative iodine 

 reactions the raw grains behave more like those of N. 

 .-m/.rr. while after the grains are boiled there are no 

 ditTercnccs noted in the three starches. In the qualita- 

 ti\e reactions with the chemical reagents peculiarities of 

 tx.th parents are e\ident. In the reactions with chloral 

 IM draff, ehnaiuc acid, nitric acid, and sulphuric acid the 

 relationship is, on the whole, closer to JV. empress; but 

 in the pyrogallic-arid reaction the relationship is cloeer 

 to the other parent 



Ktmclitm-intnutiet B*frtttd by Light, Color, and Tempera 



turr Reaction*. 

 Polariiation: 



N. emprea*, low to high, value 42. 



N. alhieana. low to high, lower than in N. emprea*. value 37. 

 N. madam* de graaff. low to high, the tarn* a* in N. albiean*. 



value 37. 

 I i 



N. emprea*. moderate, value 50. 

 N. alhteana. moderate, higher than in N. emprea*. value 55. 



..dame de graaff. moderate, the aame aa in N. emprea*, value 50. 

 OenUao violet: 



N. emprea*. light to moderate, value 43. 



N. albJeana. light to 

 value 40. 



derate 



hat lee* than in N. empmw, 



N. madaroe de graaff, light to moderate, the aune a* in N. eatprcas, 



value 43. 

 Safranin: 



N. emprea*. moderate, value 53. 



N. albicans. moderate, anmewhat leaf than in N. emprra*. value 60. 



N. madamedegraaff. moderate, the HUDeaa in N. empreaa, value 63. 

 Temperature: 



N. emprew. in majority at 70 to 71*. in all at 73 to 74*. mean 73.5. 



N. albteana, in majority at 70.2 to 72*. in all at 73 to 75. mean 74. 



N. madam* de graaff. in majority at 70 to 72, in all at 78.5 to 75, 

 . 74.2S. 



The reactivity of N. emprtss is higher than that of 

 the other parent in the reactions with polarization, gen- 

 tian violet, safranin, and temperature; and lower in the 

 iodine reaction. The reactivity of the hybrid is the 

 same or practically the same as that of .V. emprent in the 

 reactions with iodine, gentian violet, and safranin, and 

 the same or practically the same as that of the other 

 parent in the polarization, iodine, and temperature reac- 

 In no reaction is there interned iatenew of the 

 hybrid. 



Table A 20 shows the reaction-intensities in percent- 

 age of total starch gelatinized at definite time-intervals. 



VELOCITY-REACTION CfHVES. 



This section treats of the velocity-reaction curves of 

 the starches of Xarcwstu emprea. N. albicans, and .V. 

 madame de graaff, showing the quantitative differ 

 in the behavior toward different reagents at definite 

 time-intervals. ( Charts D 3 1 7 to D .r . 



A 30. 



The most conspicuous features of these charts are: 



(1) The close correspondence in the courses of the 

 three curves in all of the reactions (with the exception 

 of the sulphuric-acid reaction, in which reaction is so 

 rapid that there is no differentiation), and the tendency 

 mostly to moderate to low reactivity. 



(2) The varying relations of the parental curves to 

 each other and the hybrid in the different reactions, ex- 

 cepting the sulphuric-acid reaction during the progress 

 of the reactions. 



(3) The curve of N. empress is distinctly lower than 

 that of the other parent in the reactions with chloral 

 hydrate, chromic acid, py regal lie acid, and nitric acid, 

 especially in that with pyrogallic acid. 



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

 the chloral-hydrate reaction; lowest with chromic acid 

 and nitric acid ; and intermediate with pyrogallic acid. 

 In the reactions with chromic acid and nitric acid it is 

 more closely related to N. empress, while in those with 

 chloral hydrate and pyrogallic acid more closely related 

 to -V. albicans. 



(5) A tendency to an early period of resistance fol- 

 lowed by a comparatively rapid reactivity is noticed in 

 the reactions with chromic acid and pyrogallic acid in 

 all three starches in the former and in two in the latter. 

 There are also suggestions of early resistance in the other 

 two reaction?. 



(6) The earliest period at which the three curves are 

 beet separated for differential purposes is in the sul- 

 phuric-acid reaction at the very beginning of the reac- 

 tions; in those with chromic acid, pyrogallic acid, nitric 

 acid, and chloral hydrate at 15 minutes. 



REACTION-INTENSITIES OP THE HYBRID. 



This section treats of the reaction-intensities of the 

 hybrid as regards sameness, intermediateneaa, excess, 

 and deficit in relation to the parents. (Table A 20 and 

 Charts D 31 7 to D 322.) 



The reactivities of the hybrid are the same as those 

 of the seed parent in the reactions with iodine, gentian 

 violet, and safranin ; the same as those of the pollen 

 parent in the polarization reaction ; the same as those 

 of both parents in none; intermediate with pyrogallic 



