150 



A MANUAL OF BACTERIOLOGY 



young and otherwise healthy men women much 

 less often.' De Lacerda believes that the bacillus 

 is derived from rice which has undergone a peculiar 

 alteration. 



The epidemic spread of this disease is probably 

 influenced by climate, and seems to coincide with 

 conditions of high atmospheric moisture and extreme 

 thermometric variations. 1 



Bacillus alvei. This microbe produces the disease 



known as ' foul- 

 brood ' of bees, and 

 it has been thor- 

 oughly investigated 

 by Cheshire and 

 Cheyne. 2 It mea- 

 sures 4 fjL in length 

 and '5/4 in breadth, 

 and the oval spores 

 which it produces 

 measure 2'1 //, in 

 length and 17 JJL in 

 FIG. 85. BACILLUS ALVEI. breadth. JB. alvei 



. 



blood and juices of 

 the larvae, drones, workers, and queens, and is 



1 For further information see Dr. Felkin's paper in Proceed- 

 ings of Royal Society of Edinburgh, vol. xvi. p. 291 ; Dr. E. 

 Baelz's paper in Mittheil. Deuts. Gesellschaft fur Natur- und 

 Volkerkunde Ostasiens, Bd. iii. p. 301 ; Dr. Anderson's paper in 

 Transactions of Asiatic Society of Japan, vol. vi. ; Dr. Wernich's 

 Geographisch-medicinische Studien ; Dr. Scheube's Die Japan- 

 ische Kak-ke; and the Japanese reports by Drs. Takaki and 

 Miura. 



2 Journal of Royal Microscopical Society, 1885, p. 582. 



