302 



BOTANICAL GAZETTE 



[OCTOBER 



measurements 



solutions hasten somewhat the rate of elongation of the embryo, 

 and that the maximum effect appears at about N/3000 in a 5-hour 



period, but the effect is not great. 



emb 



lous concentrations of NaOH 

 The solutions were protected 



from C 

 formed 



from 



from 



experiments 



TABLE VII B 



Average percentage of elongation for 10 embryos each in water and the NaOH 



solutions mentioned. 



o.oiNNaOH.. 

 o.ooiNNaOH. 



Water 



0.0001 N NaOH 

 N/3000 NaOH . . 

 Water 



1 hr. 



2 hrs. 



3 hrs. 



12.9 



17.8 



23 -5 



12.7 



19. 2 



24.9 



I0.2 



16.5 



22.6 



II. 9 



18.9 



2S.O 



II .9 



18.O 



24.2 



IO.4 



173 



23.2 



4 hrs. 



5 hrs. 



20 hrs 



28.2 

 32.6 

 27.O 



30.7 

 27.6 



28.0 



30 



35 

 30 



34 

 30 



30 



5 

 7 

 3 



7 



4 



1 



43 

 49 

 42 



46 

 40 



39 



o 

 o 



9 

 9 



3 



o 



In each case the results in the various solutions should be com- 

 pared only with their corresponding checks in water; also the checks 

 in water are not comparable with each other, because the various 

 experiments were not run at the same temperatures. 



imbibition rate very 



ptimum 



centra tion which for a 20-hour period lies in the region of 0.001 N 



NaOH 



Such 



imum 



colloid gels in the case of both acids and bases. 



in 



certain 



doing 



means 



increase in 



in force of elongation. If this be so, the base and perhaps the acid 

 may further the breaking of the coat in part by an effect on the 

 embryo. 



4. Turgor imbibition and growth elongation of the 



EMBRYOS. 



xperiments 



