38 



Hydration and Growth. 



and hydrochloric acid taken from a solution by various materials comes 

 within the range of this chapter. In these tests 3 to 6 grams of the 

 colloid or of the plant material were placed in a dish containing about 

 100 c. c. of the acid solution at 21° C. The results are given in table 18. 



Table 18. — Wcder absorbed from hydrochloric add per gram dry substance. 



Material. 



Agar A 



Agar B 



Agar C (only one determination in each 



cone, for agar C) 



Agar A (48 hours) 



Agar A (4 days) 



Agar A (7 days) 



Agar A (10 days) 



Agar A (14 days) , 



Agar-gelatin , 



Gelatine (Cox's) 



Lupinus albus cotyledens , 



Vicia faba cotyledons 



Phaseolus lunatus cotyledons 



Starch (commercial "corn starch") . . . , 

 Coconut (commercial shredded, after 



removal of oil and sugar) 



Concentration. 



N/20. N/10. N/5. N/2 



2.312 

 4.242 



4.275 



4.620 

 14.362 

 1.368 

 1.096 

 1.169 

 .822 



5.884 



2.164 



3.917 

 2.944 

 3.693 

 2.688 

 2.678 

 2.731 

 4.065 

 9.830 

 1.504 

 1.163 

 1.181 

 .804 



5.891 



3.497 

 3.570 



3.821 

 5.892 

 1.514 

 1.112 

 1.257 

 .786 



5.645 



3.571 

 3.461 



3.913 

 5.019 

 1.602 

 1.079 

 1.210 

 .812 



6.678 



The amount of acid absorbed was greatest in all cases from the high- 

 est concentrations used. The amount of hydration which accom- 

 panied the incorporation of the acids in the colloids is given in 

 table 19. 



Table 19. — Absorption of hydrochloric add and water from solution, per gram dry 



substance. 



Material. 



Agar A 



Agar B 



Agar C (only one determination 

 in each concentration for 

 agar C) 



Agar A (48 hours), 4 determi- 

 nations 



Agar A (4 days), 2 determina- 

 tions 



Agar A (7 days), 3 determina- 

 tions 



Agar A (10 days), 3 determina- 

 tions 



Agar A (14 days), 1 determina- 

 tion 



Agar-gelatine 



Gelatine (Coxe's) 



Lupinus albus cotyledons 



Vicea Faba cotyledons 



Phaseolus lunatus cotyledans . . 



Starch (commercial starch) .... 



Coconut (commercial shredded 

 after removal of sugar and oil). 



Hydrochloric acid, grams. 



N/20. N/10. N/5. N/2 



0.01115 

 01177 



.01331 



.01941 

 .04130 

 .00843 

 .01269 

 .01250 

 .00259 



.02344 



0.01591 



.02151 



.01735 



.01913 



.01476 



.01386 



.01373 

 .02508 

 .05577 

 .01700 

 .01918 

 .01996 

 .00442 



.03586 



0.03168 



.03457 



.03433 

 .06991 

 .02490 

 .02636 

 .02672 

 .00779 



.04789 



0.06990 



.06892 



.07705 

 .11075 

 .04173 

 .03191 

 .03482 

 .01434 



.08969 



Water, grams. 



N/20. N/10. N/5. N/2, 



2.312 

 4.242 



4.275 



520 

 362 

 368 

 096 

 169 

 822 



5.884 



2.164 



3.917 

 2.944 

 3.693 

 2.688 

 2.678 



731 

 065 

 830 

 504 

 163 

 181 

 804 



5.891 



3.497 



3.570 



821 

 892 

 514 

 112 

 257 

 786 



6.645 



3.671 



3.461 



3.913 

 5.019 

 1.602 

 1.079 

 1.210 

 0.812 



5.678 



