104 BOTANICAL GAZETTE . ; [aucusr 
seem to have in this case a means of distinguishing clearly between 
nutritive and protective action. 3 
TABLE IV 
WHEAT (GROWTH DURING 30 DAYS). ALL QUANTITIES GIVEN ARE CUBIC 
CENTIMETERS OF 0.12 m SOLUTIONS 
: |Aggregate length} Corresponding le Aggregate length 4 
Culture solution of roots per point on curve Culture solution bo : 
plant in mm ( | antl in inde 
CaCl, .....-... 85 A BOT cen 85 
too CaCl, too CaCl, | 
10 NaCl : Saha 100 B to KCl pews 105 
too CaCl, : : too CaCl, 
25 NaCl oh wraeiete 117 Cc 25 KCI ear ae See | 125 
too CaCl too CaCl 
50 NaCl t ee 50 D 50 KCl Be Sy ea 174 
Io0o0 CaCl, : 00 CaCl, | 
too NaCl ; reiseen 198 E oo KCl oe | 230 
50 CaCl, o CaCl, | 
TOO UNaGh yo 262 ig s KCl i eereee| 337 
25 CaCl, ) 25 CaCl, 
too Nach 407 = 342. G eel Rie 420 
oben 15 CaCl, 
100 NaCl f BSE 39° H in een ae 464 
to CaCl 1o CaCl, 
100 Na on ries 5d 416 I ao EC) Creeseegce 492 
5 CaCh " CaCl, 
200 NACL Ss — ee oe fac 507 
rt CaCl t CaCl | 
100 NaCl ; Paws ese 300 K 16s KCL teens 3.46 
NaCl Mike weary 55 5 ae 66 
Distilled water, 72 5 ma 
SUMMARY 
The accepted idea that sodium and potassium have entirely 
different effects upon plants is not valid in the field of toxic and 
protective action. Here their behavior shows the close similar! 
which their near chemical relationship would lead us to expect. 
UNIVERSITY OF CALIFORNIA 
BERKELEY 
