THITONIA. 



117 



TABLE A 36. 



, r>; >. : * 



-.....:. . : 

 T. 



T. eroeoamia aurra 

 T. 



I!-. !r .".. :.:..: 



T. potuii 



T. erocoatnia aura* 

 T. rrocotmaflon 

 Foluuum hydroxide 

 T. potUti 

 T. crootxmia ur 

 T. 



^- -:.,::. J. '. :: \. '. 



s-.liura lutfrhHr 



1 - -: . . .- i 



Inaium nitratr 



Strontium nitrate 



T. cmeoimU aurm 



Cupric chloride: 



lUnum chloride 



NtNMli :.. r,:. 



has a somewhat lower reactivity. The difference* are. 

 on the whole, such u to suggest well-eeparated species. 

 ) The curve* of the hybrid bear varying relation- 

 lie parental CTirve*, tending for the moat part 

 to mtermediatenes* and toward the curve* of the *eed 

 parent 



<( An early period ,,f marked resistance i* rarely 

 observed, but to the contrary the opposite tendency i* 

 usually present, to that the percentage of starch gela- 

 tinized BOO* the first 5 tniiiute* i* pr..|.rti..iiat*ly 

 larger, commonly very much larger, than at any subse- 

 quent A-minute int.-rval. An earl}' ]HTUM| of reiustance i* 

 noticeable particularly in the reaction* with chromic pid 

 and nyrogallic acid, while a low degree of "*itan< i* 

 noted particularly in those with hydrochloric add, potas- 

 sium sulphocyanate, Rodium livdrnxidc. ...limn xulphide, 

 and sodium salicylate (T. potUii and the hybrid). 



(4) The earliest perir>d during the 60 minute* at 

 which the three curves are beat teparated, and hence 

 the beat time for the differentiation of the itarche*, i* 

 variable in relation to the different reagent*. Approxi- 

 mately this period occurs at the end of 5 minute* in 

 the reactions with potassium sulphocyanate, sodium ml- 



Ehide, and sodium salicylate; at 15 minutes with chloral 

 ydrate, chromic acid, pyrogallic acid, hydrochloric 

 acid, potassium iodide, sodium hydroxide, calcium ni- 

 trate, uranium nitrate, copper nitrate, cupric chloride, 

 and mercuric chloride; at 30 minute* with nitru- and. 

 potassium hydroxide, *trontium nitrate, and <i>lmlt ni- 

 trate; and at GO minutes with potassium suljihi.l.-. 



KXACTION-INTKNBITIES OF T1IK IlYBKID. 



This section treats of the reaction-intensities of the 

 hybrid as regards sameness, intermediateneaa, excess, and 

 deficit in relation to the parent (Table A 35 and 

 Charts D 484 to D 504.) 



The reactivities of the hybrid are the same as those 

 of the seed parent in the gentian-violet and temperature 

 reactions; the same as those of the pollen parent in tin- 

 cobalt-nitrate reaction ; the same as those of both parent* 

 in the sulphuric-acid and barium-chloride reactions; in- 

 termediate in those with iodine, chromic acid, pyrogallic 

 acid, hydrochloric acid, potassium hydroxide, potassium 

 iodide, potassium sulphocyanate, potassium sulphide, so- 

 dium hydroxide, sodium sulphide, sodium salicylate, cal- 

 cium nitrate, uranium nitrate, O>|I|MT nitrau-, cu|>n<- 

 chloride, and mercuric chloride (in II In- ing closer to the 

 seed parent and in 2 closer to the |x>llm pan-nt) ; high- 

 est with safranin, nitric acid, and strontium nitrate (in 

 3 being closer to the seed parent and in th<- other to 

 the pollen parent) ; and lowest with polarization and 

 chloral hydrate, in both being closer to the seed parent. 



The following is a nummary of the reartion-intensi- 

 tiea: Same as seed parent, 2 ; same as pollen parent, 1 ; 

 same as both parents, 2; intermediate, 17; highest, 3; 

 lowest, 2. 



The pollen parent seem* to have had very little in- 

 fluence in determining the character* of the starch of the 

 hybrid. The tendency to intermediatenea* of the hybrid 

 is exceptionally well marked, and there i* very littl.- 

 tendency for the hybrid < urve to be higher or lower than 

 the parental curve*. 



COMPOSITE CURVES or REAcnox-twrnrsmM. 



This section treats of the com posit* curve* of the 

 reaction-intensities, showing the differentiation of the 

 starches of Tritonia potlni. T. rrocoswia awrso, and 

 T. crocotmoflom. (Chart E 35.) 



Among the eonspicoow features of the chart are: 

 (1) The usually well-marked separation of the 

 carve* of the parents, together with an almost invariably 



