384 SANITARY ENTOMOLOGY 



insects, Cao has found this organism derived from the feces fatal to ani- 

 mals (Cao 1906a). 



Sarcina aurantiaca Lindner and Kocli. Cao (1906a) isolated this 

 organism from the feces of Blatta orientalis, and found it nonpathogenic. 

 In various experiments he fed it to roaches, finding that when fed in con- 

 nection with a diet of bread and an infusion of putrid beef liver, a diet of 

 bread and an infusion of 1 per cent peptone, and a diet of bread Avith 

 a putrid infusion of beef flesh, it became slightly pathogenic after recov- 

 ery from the feces of the roach. 



Sarcina lutea Schrocter was isolated by Cao (1906a) from the feces 

 of Blatta orientalis and found nonpathogenic. In various experiments he 

 fed it to roaches in connection with other foods, finding it nonpathogenic 

 in all but four tests when it was given with infusion of putrid liver, pep- 

 tone, or beef, in which cases it was slightly pathogenic after recovery from 

 the feces of the roach. 



Staphylococcus pyogenes alhus (Rosenbach) and S. p. aureus (Rosen- 

 bach), the causes of many forms of SEPTICEMIA, have been proven by 

 Herms to be capable of carriage by the Croton bug, Blattella germanica, 

 on its feet, and he has shown that it can contaminate food on which it 

 feeds, or with which it comes in contact, and also that both varieties can 

 be found on the cockroach in nature. 



Thallophyta: Fungi: Bacteriaceae 



Bacterium anthracis (Davaine), the cause of ANTHRAX, was fed by 

 Kiister to Blatta orientalis and later recovered from its feces. 



Bacterium cholerae gallinarum (Perroncito), the cause of FOWL 

 CHOLERA, was experimented with by Cao (1906a) in an attenuate form 

 by feeding it to the cockroach Blatta orientalis. When fed to starved 

 roaches without their food it passed tlirough the intestines without an 

 increase in virulence, but when fed to the roach in conjunction witli a 

 diet of bread with a putrid infusion of beef liver the organism partially 

 regained its lost virulence. Kiister also fed this organism to B. orientalis 

 and recovered it from the feces. 



Bacillus coli Escherich, a pathogenic organism normally found in the 

 alimentary canal of man and animals, sometimes causing various types of 

 diseases, has been isolated readily by Cao (1906a) from the feces of Blatta 

 orientalis. He found that it remains in the intestines of the roach even 

 after prolonged fasting. The various strains obtained varied in patho- 

 genicity. When fed to the roaches in connection with other food it some- 

 times greatly increased its virulence by passage through the insects. 



Bacillus fluorescc7is liquefasciens Fluegge, a fluorescent organism, was 

 isolated by Cao from a series of Blatta orientalis, but he obtained no 



