BEGONIA. 



119 



Table A 36 shows the reaction-inten itiee in percent- 

 of total Btarch gelatinized at definite intervals 

 ( seconds and minul 



Velocity bea< tion < !i i.-. 



This section treats of tin- veloi 

 the starches of Beg> m scarlet, I', soco- 



trana, and B.mrs. I iwing quantitative differ 



in the behai ior toward different reagents at definite time- 

 intervals. (Charts D50S to D 5 



The most conspicuous features of this group of era 

 are: 



( 1 ) The extraordinary variation of the relations of 

 the curves in the different charts : in some, all three ci 

 being practically identical or close together; in others, 

 two curves keeping close and the third well separated or 

 even separated to the extreme; and in others, .ill three 

 being well separated from one another. Th 

 liarities are due largely primarily to the remarkable 

 variations in the reactivities of B. socotraua in re 

 in the different reagents (with one reagent being 

 reactive and with another the reverse) ; an darily 



to the almost uniformly very high reactivities of B. single 

 crimson scarlet (18 very high, 2 high, and 1 low), to- 

 gether with the marked variations in the relationships 

 of the hybrid to /.'. single crimson scarlet, the hybrid 

 being in many reactions identical or practically identical 

 with this parenl and in others having varying di 

 intermediateness, but being much closer, as a rule, to this 

 parenl than to the other. Excepting the sulphuric-acid 

 and potassium-hydrate charts, in which the reactions of 

 all three starches are shown to occur with great rapidity, 

 there is a tendency to a well-marked or even extreme 

 separation of the parental curves, the starch of B. single 

 crimson scarlet showing, with one exception (barium 

 chloride), a very high to high reactivity, and thai of 

 B. socotraua, with seven exceptions (chloral hydrate, 

 chromic acid, nitric acid, sulphuric acid, potassium hy- 

 droxide, potassium sulphide, and sodium salicylate) a 

 low or usually very low reactivity. 



(•■i) The higher reactivity of li. single crimson scar- 

 let than of 1>. socotrana with chloral hydrate, chromic 

 acid, pyrogallic acid, nil ric acid, hydrochloric acid, potas- 

 sium iodide, potassium sulphocyanate, potassium sul- 

 phide, sodium hydroxide, sodium sulphide, sodium sali- 

 cylate, calcium nitrate, uranium nitrate, strontium ni- 

 trate, cobalt nitrate, copper nitrate, cupric chloride, 

 barium chloride and mercuric chloride, and the same 

 reactivities with sulphuric acid and potassium hydroxide, 

 arc small differences in the reactivities of the 

 parents with chloral hydrate, potassium sulphide, and 

 -odium salicylate, and from large to very large differ- 

 ences in the other reactions noted, excepting the sul- 

 phuric-acid and potassium-hydroxide reactions, in which 

 the two are the same. 



(3) The tendency of the hybrid curves to be the 

 same or nearly the same as the curves of li. single crim- 

 son scarlet, or be of ome degree of intermediateness, 

 usually closer to this parent, throughout the wh 

 of reactions. (Sec following subsection.) 



(I) A period of early resistance followed by a com- 

 parative rapid reaction is conspicuous for its almost en- 

 tin absi nee. Such a period is suggested in the reactions 

 of the hybrid in the calcium-nitrate reaction, in /.'. single 

 crimson scarlet in the barium-chloride reaction, and in 

 B. socotrana in the chromic-acid reaction. 



(5) The earliest period during the 60 minutes at 

 which the three curves an- best separated to differentiate 

 tin starches varus with the different reagents. With 

 i'im exceptions this occur- in 5 minutes. The exceptions 



