ENTOMOLOGY

384 SANITARY ENTOMOLOGYinsects, Cao has found this organism derived from the feces fatal to animals(Cao 1906a).Sarcina aurantiaca Lindner and Koch. Cao (19060.) isolated thisorganism from the feces of Blatta orientalis, and found it nonpathogenic. -In various experiments he fed it to roaches, finding that when fed in connectionwith a diet of bread and an infusion of putrid beef liver, a diet ofbread and an infusion of 1 per cent peptone, and a diet of bread witha putrid infusion of beef flesh, it became slightly pathogenic after recoveryfrom the feces of the roach.Sarcina lutea Schroeter was isolated by Cao (1906a) from the fecesof Blatta orientalis and found nonpathogenic. In various experiments hefed it to roaches in connection with other foods, finding it nonpathogenicin all but four tests when it was given with infusion of putrid liver, peptone,or beef, in which cases it was slightly pathogenic af.ter recovery fromthe feces of the roach.Staphylococcus pyogencs albus (Rosenbach) and S. p. aurcus (Rosenbach),the causes of many forms of SEPTICEMIA, have -been proven byHerms 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 itfeeds, or with which it comes in contact, and also that both varieties canbe found on the cockroach in nature.Thallophyta: Fwngi: BacteriaceaeBacteriwm anthracis (Davaine), the cause of ANTHRAX, was fed byKuster to Blatta orientalis and later recovered from its feces.Bacteriwm cholerae gallinarum (Perroncito), the cause of FOWLCHOLERA, was experimented with by Cao (190680) in an attenuate formby feeding it to the cockroach Blatta orientalis. WIlen fed to starvedroaches without their food it passed through the intestines without anincrease in virulence, but when fed to the roach in conjunction with adiet of bread with a putrid infusion of beef liver the organism partiallyregained its lost virulence. Kuster also fed this organism to B. orientalisand recovered it from the feces.Bacillus coli Escherich, a pathogenic organism normally found in thealimentary canal of man and animals, sometimes cau.sing various types ofdiseases, has been isolated readily by Cao (1906a) from the feces of Blattao rientalis. He found that it remains in the intestines of the roach evenafter prolonged fasting. The various strains obtained varied in pathogenicity.When fed to the roaches in connection with other food it sometimesgreatly increased its virulence by passage through the insects.Bacillus fluorcscens liquefasciens Fluegge, a fluorescent organism, wasisolated by Cao from a series of Blatta. prientalis, but he obtained no