36 
Table ]S^o. 25. — Two per cent formalin {37.2 per cent aldehyde). 
Organism. 
Time of exposure to formalin. 
i 
Minutes. Hours. 
Control 
grew in — 
10. 
20. 
30. 40. 50. 1. 
'U. 2. 
Vibrio cholera 
24 hours. 
B. coli communis 
— 
-f- 
-r ~ -i" -rS. 
— 
Do. 
B. diphtherise 
Do. 
B. mellei 
Do. 
B. pvocvaneus 
Do. 
B. dvsenterige Shiga) 
-h 
"r 
-r T- -r — S- 
— — 
Do. 
Staphylococcus pyogenes albus 
-r 
-f- 
-r — -f -r 
— — 
Do. 
Staphylococcus pyogenes aureus 
-f 
-i- — 
— — 
Do. 
B. typhosus ’. 
-r 
“ ~ “ 
Do. 
This table shows that none of the bacteria tested resisted an expo- 
sure of longer than sixty minutes to a '2 per cent solution of formalin. 
The fact that the colon, dysentery, and typhoid bacillus and thg^iiocci 
were more resistant is shown in this table. 
Table Xo. 26. — Three per cent formalin [37.2 per cent aldehyde) 
i. 
Organism. 
Vibrio cholera 
B. coli communis 
B. diphtherise 
B. mallei 
B. pyocyaneus 
B. dysenterise ( Shiga i 
Staphylococcus pyogenes albus . 
Staphylococcus pyogenes aureus 
B. typhosus 
Time of exposure to formalin. 
1 
Minutes. 
Hours. 
Control 
grew in — 
10. 
•20. 
30. 40. 
50. 1. 
n. 
2. 
•24 hours. 
— 
4- 
■ — 
— 
— 
Do. 
— 
— 
— — 
— 
— 
Do. 
— 
_ 
— — 
— — 
— 
— 
Do. 
— 
— 
— 
— — 
— 
— 
Do. 
— 

— 
— 
Do. 
-h 
-f- ~ 
— _ 
— 
— 
Do. 
Do. 
-1- 
-s 
“ _ 
Do. 
Only one of the organisms. B. dysenteriee. tested resisted an expo- 
sure to 3 per cent formalin forty minutes: this organism. B. coU. and 
Stajdiylococeus alhus again show to be more resistant than the others 
tested. 
Table Xo. 27. — Fire per cent formalin {37 . 2 per cent aldehyde). 
Organism. 
Time of exposure to formalin. 
Minutes. Hours. i 
1 
Control 
grew in — 
10. 
•20. 30. 
40. ; 50. 
1. 
li- 
2^ 
Vibrio cholera 
! 
1 
24 hours. 
B. coli communis 
-h -id 
- 1 - 
— 
— : 
Do. 
B. diphtheirte 
Do. 
B. mallei 
— 
_ — 
— — 
— 
— 
— 
Do. 
B. pyocyaneus 
Do. 
B. dysenterise (Shiga) 
-i 
^d - 
“ 1 
— 
— 
Do. 
Staphylococcus pyogenes albus 
— 
^ -^d 
— 1 — 
_ 1 
— 
— 
Do. 
Staphylococcus pyogenes aureus 
— 
-d - 
— 1 — 
— j 
— 
— 
Do. 
B. typhosus 
— 
-d - 
— ! — 
— ! 
1 
Do. 
This table shows practically the same results as with 3 per cent 
formalin. It would seem that there are a few of the org-anisms that 
