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bacteriologist. In fact, we may say that the 

 French idea is rapidly gaining ground, and that 

 our science would be more correctly denomi- 

 nated if it was called micro-biology, than 

 restricted to the study of the bacterial forms. 



Naturally the most important contributions 

 to this line of science have been in the field 

 which has included the greatest amount of 

 endeavor. The relative predominance of medi- 

 cal inquiry has of course resulted in the maxi- 

 mum degree of effort being spent in this line. 

 In this field American workers have made 

 great progress in attacking American prob- 

 lems. It would be impossible and perhaps un- 

 necessary to go into such a recital in detail, yet 

 it may not be amiss to mention in passing some 

 of the more' salient discoveries which have been 

 made in the respective fields. Take the work of 

 Theobald Smith and his associates on Texas 

 fever. Te problem here was to unravel the 

 mystery surrounding a disease which from a 

 practical point of view seriously impaired the 

 agricultural development of a large section of 

 our country. At the time when the causal 

 agent of this disease was discovered, the rela- 

 tion of protozoan forms to pathological pro- 

 cesses was not as well appreciated as it is now. 

 The discovery of the causal organism and the 

 working out of its life history, especially in 

 relation to its intermediate host, will always 

 remain as a classic example of experimental 



