274 



A MANUAL OF BACTERIOLOGY 



number of microbes suspended in the air depends 

 upon the number of people present and the amount 

 of disturbance of the air which is taking place. 



Dr. Fischer 1 has proved that sea air is almost free 

 from microbes. Carnelley 2 and Pe'tri 3 have also 

 shown that the air of sewers is remarkably free 

 from microbes. This is due to the moisture on the 

 walls of these subterranean channels. 



The following microbes are always present (more 

 or less) in the atmosphere : 



Micrococcus citreus conglomerate. 

 Micrococcus violaceus. 

 Micrococcus rosaceus. 

 Bacterium indicum. 

 Micrococcus prodigiosus. 

 Bacterium aceti. 

 Bacterium lactis. 

 Micrococcus cyaneus. 

 Bacterium xanthinum. 

 Bacillus figurans. 

 Micrococcus carnicolor. 

 Micrococcus candlcans. 

 Micrococcus albus. 

 Sarcina lutea. 

 Surcina aurantica. 

 Bacillus Jluorescus. 



Micrococcus liquefaciens. 

 Sarcina liquefaciens. 

 Micrococcus gigas. 

 Micrococcus chryseus. 

 Bacillus aurescens. 

 Bacillus aureus. 

 Bacillus citreus. 

 Bacillus plicatus. 

 Bacillus chlor'mus. 

 Bacillus polymorphic. 

 Bacillus profusus. 

 Bacillus pestifer. 

 Bacillus Icevis. 

 Bacillus cereus. 

 Bacillus subtilis. 



Besides other microbes, there are always present 

 in the atmosphere an abundance of moulds and 

 yeast-fungi. 



Although the microbes connected with the com- 

 mon infectious diseases have not been discovered in 



1 Zeitschrift fur Hygiene, vol. i. 



2 Philosophical Transactions, vol. clxxviii. p. 61. 

 * Zeitschrift fur Hygiene, vol. iii. 



