68 Chittenden and Painter—Influence of Therapeutic 
Ferric chloride. 
With this salt we obtained the following results: 
FegClg¢.- Wt. Cu in 4. SU HeTB IES, sonvored: 
0 0-1740 gram. 0°3560 gram. 32°04 per cent. 
0°0005 percent. 0°1597 0°3260 29°34 
070020 0°0437 0:0908 817 
0°0100 0°0095 0°0236 2°12 
0°0250 0 
Sternberg states that tincture of ferric chloride is effective as a 
germicide (upon micrococcus) when present to the extent of 4 per 
cent. On the unformed ferment of the saliva, it 1s, as the results 
show, much more active, its hindering action being directly propor- 
tional to the percentage of iron salt present. 
ferrous sulphate. 
With this salt of iron quite different results were obtained; and 
as we wished simply to compare its action with that of the ferric 
salt, only very small percentages were experimented with. 
FeSO4,+7H20. Wt. Cu in ¥. veareitie eiea, convened 
0 0°1245 gram. 0°2532 gram. 22°78 per cent. 
0:0005 per cent. 071037 0°2108 18°97 
0:0020 0°1323 0°2692 24°22 
0°0100 0°1365 0°2780 25°02 
Here there is decided stimulation with the two larger percentages, 
while the smallest per cent. shows an apparent decrease of amylolytic 
action. 
Kjeldahl* found that this salt exercised a strong hindering action 
on the amylolytic ferment of malt. 
Potassium permangunate. 
Sternberg places this salt next to mercuric chloride in germicide 
value, it being efficacious in 0°12 per cent. With the unformed fer- 
ment of the saliva it is likewise active, although no more so than 
many other salts experimented with. Following are the results: 
Total amount Starch 
KoMnogQOg. Wt. Cu in 4. reducing bodies. converted. 
0 0°1475 gram. 0°3004 gram. 27°03 per cent. 
0°005 per cent, 0-1012 0°2060 18°54 
0°025 0 
* Jahresbericht fiir Thierchemie, 1879, p. 382, 
: 
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