CC ALCO. 2P Pa. CC. ALC. TO PPT. 
GEL. IN H20 
20 10 \ GEL. + NaOH .01I5M 
GEL.+ CaClz 1.5M 
15 
ARGRIOE ING ELO 
10 
0 2M 0 7 2M 
ACETIC ACID-——> | Naci ——> 
Fia. 5. Fia. 6. 
Fic. 5. Curves showing how strong concentrations of CaClk (1.5 m) 
make precipitation of the gelatin by alcohol possible even in high con- 
centrations of acetic acid. This shows antagonism. (See Table V.) 
Fic. 6. Curves showing the effect of NaCl on H,O-gelatin (dotted line) 
and NaOH-gelatin. Antagonism is shown by the drop of the NaOH curve. 
(See Table VI.) 
TABLE VY. 
Antagonism between High Concentrations of CaCl, and Acetic Acid. 
Acetic acid.* | Acetic acid in gelatin plus CaCle 1.5 Mj 
Concentration of Ce. alcohol to Concentration of Ce. alcohol to 
acetic acid. precipitate. acetic acid. precipitate. 
M M 
0.138 No ppt. 4.17 19.3 
0.065 1S) 2.08 21.4 
0.033 9.25 1.04 pi a 
0.016 7.08 0.52) 2 20.7 
0.008 6.85 0.26 2 hig OARS 
0.0 4.95 0.13 18.2 
| 0.065 1 teen 
0.0325 15.7 
0.0162 Tan 
0.008 14.1 
0.004 13.7 
0.0 lone 
*2 per cent gelatin A over night at 31°C. ° 
+2 per cent gelatin A. Temperature regulator broke and the tem- 
perature varied; therefore it was not strictly comparable. Other details 
as in Table I. (See Fig. 5.) 
450 
