[LEU Sai Een se 
PLATE. 
PuaTEe I. One typical seedling from each of the 14 cultures of experiment A. Frontispiece. 
Fic. 
10. 
1A 
WA. 
13: 
14. 
15. 
16. 
alee 
18. 
19. 
20. 
21. 
TEXT FIGURES. 
) Seedlings of cultures experiment, © 999 sae ses) eee a 
mI See lingsobcul (ure Osexce nim ein Ceres see ree ees eee er ee eee 
Seedlingsiol cultures experimenti One: ep nne eee eee ee oe 
= Seedlinestotculitured0" exqperimicmt: Cee ayes sae ee a ee 
weed lings ol culture wily experiment: C2 2 seats =p eee eae 
seedlings ot culture 12 experiment Cy. ssa) eae ee 
seed ings of culture 13.-expernmentiCae- eae. so) eel ee 
Seedlings of culture 14) experiment C23 ee nee a eee 
. Curve showing relation of initial concentration of culture solutions to 
absorption and excretion of salts during growth in solutions of Mg 
2 
; : ses 6M 
(NO3). grading by increments of from distilled water to 500,000 
2M 
500,000 
Curves showing relation of initial concentration of culture solutions 
to absorption and excretion of salts during growth in solutions of 
Ca Ea grading by increments of soach00 from distilled water to 
24 
SOO s000 5 5 Boo eof OR eee RNP RIO ec ROG REAL Tce gn 
Seedlings: oficultures2;cexperimentiysr scien as area as ae ee 
Seedlings of tcultunesMexperinentigaees serene he 2 meee ere 
Seedlines:of ceulture 2 cexperumemt roses eho aoa ee 
Seedlings ofeculturel3 ,experiment Gee) ae eee ee Saar iae 
Seedlings totremlturesirexperimme mit to. > oe eee se Sete = ee 
Needlingstoi cultured vexpenment 3) (2-2 eee eerie. (a 3454 see 
Seedlings/ot culture l4-vexperiment (o>) )-c eee 2 Foo eee 
Seedlings oi culture 1s experiment 5.5 255 eee 6 a. ee 
Seedlingsiof culture 2. experiment O22. eee | eee 
Curve showing relation of initial concentration of the culture solutions 
to subsequent excretion and absorption of salts by pea roots in solu- 
tions of Mg(NO ), + Ca(NO3), in the molecular ratio -.......------ 
Curves showing relation of initial concentration of the culture solutions 
to subsequent excretion and absorption of salts by pea roots in solu- 
il 
tions of Mg(NO;). + Ca(NO3), in the molecular ratio 7-------------- 
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