GERMICIDES AND ANTISEPTICS. 233 



Sulphuric Acid destroys B. termo and the two 

 species of micrococcus experimented upon in the 

 proportion of 1 : 200 ; but a four per cent solution 

 failed to destroy the bacteria in broken-down beef- 

 tea (old stock), doubtless because of the presence 

 of reproductive spores. The multiplication of the 

 bacteria mentioned was prevented by the presence 

 of this acid in a culture-solution, in the proportion 

 of 1 : 800 (S). One part in 3,353 prevented the 

 development of bacteria in unboiled meat-infusion, 

 and 1 : 72 destroyed the bacteria of broken-down 

 beef- tea (de la Croix). One part in 161 destroyed 

 bacteria developed in tobacco-infusion (Bucholz). 



Sulphurous Acid. Exp. No. 35, Jan. 15, 1880. 

 Five children were vaccinated from ivory points 

 which had been exposed for six hours to an atmos- 

 phere (dry) containing one per cent of sulphur 

 dioxide (collected over mercury), and with five 

 other points, from the same lot, not disinfected. 

 Result : Vaccination was unsuccessful in each case 

 with the disinfected points, and successful with 

 those not disinfected (S). In four experiments in 

 which <3ry vaccine was exposed to the fumes of 

 sulphurous acid, for ten minutes, its infecting 

 power was destroyed (Baxter). Sulphurous acid 

 has no influence upon the bacteria of symptomatic 

 anthrax (Arloing, Cornevin, and Thomas). It is 

 powerless against the spores of the anthrax bacillus 

 (Koch). In the proportion of 1 : 12,649, the de- 

 velopment of bacteria in uncooked beef-infusion is 

 prevented, and in 1 : 135 it destroys the vitality 



