130 



following ones a decreasing quantity. The definite macroscopic 

 appearance of the individual strains was clearly evident; the 4 

 streaks of the same strain had always exactly the same colour, 

 intensity of growth and consistence. This was beautifully seen 

 on the plates when two strains of different appearance happened 

 to be side by side. 



In the great majority of cases the strains which were ori- 

 ginally identified as typical and atypical had the same cha- 

 racters in the new examination. The only exception was H ,'333 

 which on the first examination was found to be typical and 

 on the second, atypical, but not to a marked extent. (The 

 growth was white but of rather solid consistence and there 

 was only moderately well developed symbiosis). It is thus 

 possible that it could have been called atypical with just as 

 much right, on the first occasion. GP 1, originally atypical, 

 was called a transition form 1 at the new examination. II 127, 

 originally atypical, was almost typical on re-examination, but 

 of rather more solid consistence than the other typical ones. 



The strains H 419, 420, 423 and 421 which were also examined 



on 22. X. 21 showed the following, with regard to „symbiosi.s" 

 intensity. 



First examination 22. X. 27. X. 



H 419 None weak rather marked symbiosis 



H 420 „ m weak 



H 423 weak „ little more intense symbiosis 



H 424 none „ weak 



Strains showing a weak symbiosis reaction or none at all, were 

 found notably in healthy soldiers in Sept. 1921. Several others 

 of these strains were tested 2 or 3 times and gave practically the 

 same results, — sometimes absent reaction, sometimes weakly 

 developed. 



Among the 35 atypical Pfeiffer's bacilli from the soldiers' camp 

 in Sept. 1921, there were 13 which gave no symbiosis reaction 

 whatever on the first examination. 4 of these on a repetition of 

 the examination also gave an absolutely negative result. 1 of these 

 4 (H 424) was further tested on 2 occasions and then gave a weak 

 reaction, as mentioned above. 



As I have done, Davis (6) in particular has laid great 

 stress on „symbiosis" as a mark of recognition of Pfeiffer's 

 bacillus: „it was one of the most reliable and uniform cri- 

 teria we have for this group I have tested many hun- 



