An Atlas of the Bacteria Pathogenic in 

 the Human Subject. 



PART II. 



As stated in Part L, the object of this Atlas is to present 

 graphically from original preparations the chief bacteria which 

 are pathogenic in the human subject The figures now intro- 

 duced comprise nearly all the remaining bacteria of interest. 

 Certain are omitted Amongst such omissions may be named 

 the bacillus of influenza, diplococcus intra-cellularis, bacillus 

 enteritidis, bacillus melitensis, streptothrix pseudo-tuberculosa, 

 etc. ; and time will surely add yet others as causative agents, es- 

 pecially in the group of infective granulomata. 



Amongst the micro-organisms depicted in the present series, 

 two of the most important in practical medicine are the typhoid* 

 and diphtheria bacilli; and a succinct statement may be made 

 in regard to the bacteriological diagnosis, firstly of typhoid fever, 

 and secondly of diphtheria. 



Typhoid Fever. Although the bacteriological diagnosis 

 of typhoid during life can be made from the discovery of the 

 typhoid bacillus in the stools or the urine, such methods are of 

 little practical avail, necessitating, as they do, a well- equipped 

 laboratory and the expenditure of much time. 



Widal's Reaction. However interesting it might be to give 

 an account of the observations of previous investigators which 

 led up to Widal's application, neither space nor the main object 

 of the present article will allow of it. Widal was, however, the 

 first to demonstrate that a reaction, which had been previously 



* Other illustrations of this are given in Part I. 



53 



