262 



BARBER AND TEAGUE. 



Subject No. 2. Mukden mask. 



Saliva taken before exposure 

 Cotton from nostrils before exposure 

 Cotton from nostrils after exposure 

 Cotton before mouth after exposure 

 Cotton within the mask after exposure 



JPlate No. 

 [Plate No. 

 JPlate No. 

 [Plate No. 

 JPlate No. 

 [Plate No. 2: 

 JPlate No. 1 : 

 [Plate No. 1 : 

 JPlate No. 1: 

 [Plate No. 2 : 



Prodigiosus 

 Prodigiosus 

 Prodigiosus 

 Prodigiosus 

 Prodigiosus 

 Prodigiosus 

 Prodigiosus 

 Prodigiosus 

 Prodigiosus 

 Prodigiosus 



absent. 



absent. 



absent. 



absent. 



present. 



present. 



present. 



present. 



absent. 



absent. 



DISCUSSION OF PROTOCOL NO. 2. 



Living prodigiosus bacilli were very numerous at the beginning 

 of the test, but decreased very rapidly during the ten minutes 

 that the subjects were exposed. This must be regarded also 

 as a very severe test, though by no means so severe as the 

 preceding one. The Broquet mask withstood the tests, while 

 the Mukden mask failed to hold back all the prodigiosus bacilli. 

 This experiment, therefore, demonstrates clearly the superiority 

 of the Broquet mask over the Mukden mask. 



PROTOCOL NO. 3. (EXPERIMENTS NOS. 67 AND 68.) 



February 1, 1912. Spraying as the preceding experiment. The two 

 masked subjects were taken into the stable six minutes after the spraying 

 had been discontinued and allowed to remain ten minutes. Hot, sunshiny 

 day. Temperature in the stable 29 °C. 



Number of living prodigiosus bacilli in the air. 



Time after spraying. 



1 to 3 minutes 

 3 to 6 minutes 

 „ , . ^ f6 to 9 minutes 

 ^^'^JJ^J^k to 12 minutes 

 ■ ll2 to 15 minutes 

 15 to 30 minutes 

 Subject No. 1. 



Saliva taken before exposure 



Cotton from nostrils before exposure 



Cotton from nostrils after exposure 



Cotton before mouth after exposure 



Cotton within the mask after exposure 



Number of 



prodigiosus 



colonies. 



6,000 



2,760 



280 



127 



29 



1 



Mukden mask. 



Prodigiosus absent. 



Prodigiosus absent. 



Prodigiosus absent. 



Prodigiosus absent. 



Prodigiosus absent. 



Prodigiosus absent. 



Prodigiosus absent. 



[Plate No. 2: Prodigiosus present. 



(Cotton red and 32 colonies.) 



[Plate No. 1: Prodigiosus absent. 



1 Plate No. 2: Prodigiosus absent. 



JPlate No. 1 ; 

 1 Plate No. 2 ; 

 JPlate No. 

 [Plate No. 

 JPlate No. 

 [Plate No. 

 fPlate No. 



