s \i; UtH > 



79 



to one parent and tln-n to tin- other with chromic acid 

 and pyrogallic and. the parental relationships lieinc 

 reversal in those two reactions. 



An carh |.cri<>d of resistance followed by a < 

 parati\rly rapid reaction is wn in the rcactii-iis with 

 air nrnl and pyrogallic acid in all three starches in 

 the first ami in the two starches in the second. 



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

 best separated for differential purposes is in the sul- 

 phuric-acid reaction within the 5-mmute period ; in that 

 with pyrogallir acid at 45 minutes; ana in that with 

 chloral" hydrate at 60 minutes. 



REACTION-INTENSITIES OF TUB HYBRID. 



This section deals with the reaction-intensities of tin 

 hybrid as regards sameness, interned lateness, excess, 

 and deficit in relation to the parents. (Table A 17 and 

 Chart . D304.) 



The reactivities of the hybrid are the same as those 

 of the seed parent in the reactions with gentian violet and 

 chromic acid ; the same as those of the pollen parent in 

 those with polarization, iodine, and safranin ; the same 

 as those of both parents in none; intermediate in none: 

 highest in those with chloral hydrate, nitric acid, and 

 sulphuric arid, in all three being closer to the seed parent : 

 ana lowest in those with temperature and pyrogallic acid, 

 in both being closer to the seed parent. 



The following is a summary of the reaction-intensi- 

 ties (10 reactions) : Same as seed parent, 2; same a- 

 pollen parent, 3 ; same as both parents, ; intermediate, 

 ; highest, 3 ; lowest, 2. 



The seed parent, If. princas mary, has from these 

 data exercised a far more potent influence than .V. poeti- 

 cvt poetanim on the properties of the starch of th< 

 hybrid. 



COMPOSITE CURVES OP THE REACTION-INTENSITIES. 



This section treats of the composite curves of the reac- 

 tion-intensities, showing the differentiation of thr 

 starches of Xareitnu princes* mary, N. poeticiu poe- 

 tarvm, and .V. creuel. (Chart E 17.) 



The most conspicuous features of this chart are : 



(1) The very close correspondence in the curves, 

 both as to nearness and course. 



(2) In \. princess mary in comparison with the 

 other parent the higher reactions with gentian violet, 

 chromic acid, and nitric acid ; the lower reactions with 

 polarization and iodine ; and the same or practically the 

 same reactions with chloral hydrate, pyrogallic acid, and 

 sulphuric acid. 



(3) In N. princfss mary the very high sulphuric- 

 acid reaction ; the absence of any high reaction ; the 

 moderate reactions with iodine, safranin, chromic acid, 

 and pyrogallic acid ; the low reactions with polarization, 

 gentian violet, temperature, and nitric acid ; and the very 

 low reaction with chloral hydrate. 



(4) In N. poeticiu poetarum the very high reaction 

 with sulphuric acid ; the absence of any high reaction ; tho 

 moderate reactions with polarization, iodine, safranin. 

 temperature, and pyrogalhc acid ; the low reactions with 

 gentian violet, chromic acid, and nitric acid ; and the Tery 

 low reaction with chloral hydrate. 



(5) In the hybrid the very high reaction with sul- 

 phuric acid ; the absence of any high reaction ; the mod- 



erate reaction!) with polarization, iodine, safranin, and 

 chromic acid ; the low reactions with gentian violet, tem- 

 perature, pyrogallic acid, and nitric and; and the Tery 

 low reaction with chloral hydrate. 



The following is a summary of the reaction-intensi- 

 ties (10 reactions) : 



18. COMPARISONS or TUB STARCHES op NARCISSUS 



AB8CI88U8, N. POETICUS POETARl'M, AND N. WILL 

 SCARLET. 



In histologic characteristics, polariscopic figures, 

 reactions with selenito, reactions with iodine, and quali- 

 tative reactions with the various chemical reagents the 

 starches of the parents and hybrid exhibit pn>|M-rt<- 

 common in varying degrees of development, which collec- 

 tively in each case are distinctive, although all three 

 starches are very much alike. In histologic properties 

 the starches of the parents differ very little, and the 

 same is also true of the polariscopic figures and reactions 

 with selenite. In the iodine reactions no qualitative dif- 

 ferences were recorded. In the qualitative reactions with 

 chloral hydrate, chromic acid, pyrogallic acid, nitric acid, 

 and sulphuric acid there are properties in common and 

 also individualities. The starch of the hybrid in com- 

 parison with the starches of the parents shows a closer 

 relationship to Narcissiu abscissiu in the form of the 

 grains, the character of the hilum, the character of the 

 lamella?, and the size of the larger grains; but closer to 

 the other parent in the size of the smaller grains. The 

 eccentricity of the hilum is about the same in all three 

 starches, and in the hybrid the lamella? are more distinct 

 than in the parents, and the hilum is not so deeply and 

 extensively fissured. In the polarization figures and 

 reactions with selenite the relationship is closer to \. 

 abtcistus. In the qualitative iodine reactions it is closer 

 to .V. poeticu* poetarum. In all of the qualitative reac- 

 tions with the chemical reagents peculiarities of both 

 parents are observed, but the resemblances are, on the 

 whole, closer to A', abscissu*. Such differences as have 

 been recorded are only of a minor character. 



Reaction intmtttiri Exprtnrd by Light, Color, and 



furs Reaction*. 

 Polarisation: 



N. aberiu. low to hih. ralue 43. 



N. poctiou Doctor., low to hicb. omewbat Itw than in N. I 



ralue 4O. 



N. will .cartel, low to hih, the BUM a* in N. abadamia, ralue 43. 

 Iodine: 



N. ahKUMU. licht to moderate, value 40. 



N. portion poeUr.. liht to moderate, omewbat IMS than in N. 



abadoM, ralo* 46. 

 N. will (carle*. liht to moderate. UM BUM a in N. poMim* poet- 



aruin. ralue 45. 

 Gentian rioUt: 



N. badopi*. licbt to moderate, rahie 33. 



N. poetidM poetar. licbt to moderate, (omewbat more tWa m 



N. abadsna. raloa 36. 



N. will .cartel, licht to moderate, bister thaa in either panel, 

 ralue 37. 



