NAHCI88U8. 



73 



TABUE A 14. 



acid, pyrogallic acid, nitric acid, hydrochloric 

 B> -id. potassium hydroxide, potassium iodide, potsssinm 

 sulphocYsnate, sodium hydroxide, Mxlium sulphide, to* 

 dium Ntlu -vlatf, calcium nitrate, uranium nitrate, stron- 

 tium nitrate, and copper nitrate, and the same or 

 practically the same reactivity with sulphuric acid, po- 

 tassium sulphide, cobalt nitrate, cupru- < lili-rnlr, barium 

 chloride, and mercuric chloride. 



(3) The highest position of the hybrid curve of sll 

 three curves in all of the 21 reactions, excepting the 

 barium chloride, in which latter owing to extremely 

 slow reactions all three curves are absolutely or practically 

 the same. In many reactions the hybrid curve U more 

 separated from the parental curves than the latter are 

 separated from each other, and in most instances the 

 nearer parental curve is that of A*, poetinu ornatta. 

 There is in no instance a tendency either to intermedi- 

 ateness or to the lowest reactivity. 



(4) An early period of comparative resistance fol- 

 lowed by comparative rapid reaction is frequently 

 noticed, sometimes in the case of one, two, or three 

 of the starches. This is seen in all three starches 

 in the reactions with chloral hydrate, chromic acid, 

 pyrogallic acid, nitric acid, potassium iodide, and 

 calcium nitrate; in the two parental starches with *o- 

 dium sulphide and strontium nitrate ; and in .V. iatetta 

 grand monarque with sodium hydroxide. In several, thin 

 resistant period is prolonged to 15 to 30 minutes. 



(5) The earliest period during the 60 minutes at 

 which the three curves are best separated for differentia- 

 tion varies with the different reagents. Approximately, 

 within the 5-minute interval in the reactions with sul- 

 phuric acid, sodium hydroxide, and sodium salicylate 

 reactions ; at the 15-minute interval with chromic acid, 

 hydrochloric acid, potassium hydroxide, potassium sul- 

 phocyanate, sodium sulphide, calcium nitrate, and 

 strontium nitrate; at the 30-minute interval with chloral 

 hydrate, pyrogallic acid, nitric acid, potassium iodide, 

 and copper nitrate ; and at the 60-minute interval with 

 potassium sulphide, uranium nitrate, cobalt nitrate, cop- 

 per nitrate, barium chloride, and mercuric chloride. 



REACTION-INTENSITIES OP THE HYBRID. 



This section deals with the reaction-intensities of 

 the hybrid as regards sameness, intermediateness, excess, 

 and deficit in relation to the parents. (Table A 14 and 

 Charts D 265 to D 286.) 



The hybrid has the same reactivity as the seed parent 

 in the reactions with gentian violet and safranin; the 

 same as the pollen parent with polarization and iodine ; 

 the same as both parents with barium chloride, in which 

 the reactions are too slow for differentiation ; intermedi- 

 ate in none; highest with chloral hydrate, chromic acid, 

 pyrogallic acid, nitric acid, sulphuric acid, hydrochloric 

 acid, potassium hydroxide, potassium iodide, potassium 

 gulphocyanate, potassium sulphide, sodium hydroxide, 

 sodium sulphide, sodium salicylate, calcium nitrate, ura- 

 nium nitrate, strontium nitrate, cobalt nitrate, copper 

 nitrate, cupric chloride, and mercuric chloride (in 2 

 being closer to the seed parent, in 15 nearer the pollen 

 parent, and in 3 as near one as the other parent) ; and 

 lowest in the safranin reaction, as near one as the other 

 parent. 



The following is a summary of the reaction-intensi- 

 ties: Same u seed parent, 2; same as pollen parent, 2; 

 same as both parents, 1 ; intermediate, 0; highest, 20; 



The most remarkable feature of these data is the 

 almost universal higher reactivity of the hybrid in all 

 of the chemical reactions, the only exception being with 



