jjz EUCALYPTUS. 



The evidence seems fairly conclusive that the ordinary 

 American types of malaria are most frequently occasioned 

 in humanity by the drinking of unboiled water from shal- 

 low wells. 



I have a great number of instances that go to show this 

 to be the case. 



C. Buhman of Los Angeles, formerly a resident of Gales- 

 burg, Illinois, tells me that the boiling of the drinking 

 water in that place which he states to have become gen- 

 eral at one time, did not eradicate malarial fevers but did 

 so much diminish these fevers in the population both as to 

 numbers attacked and the intensity in those who were still 

 affected that he and others attributed the improvement to 

 boiling the drinking water. 



At Bakersfield, Central California, there prevailed for- 

 merly a specially malignant form of malarial fever. It was 

 sometimes called dengue but more generally "Bakersfield 

 fever." At that time the drinking water all came from 

 shallow wells. 



While the district in and about Bakersfield has received 

 a great accession of population the people now have a 

 healthy look very different from the old appearance and the 

 malignant fever so \vell known to old timers is no longer 

 heard of. The drinking water now comes from deep arte- 

 sian wells. 



The turning up of earth produces in malarial districts 

 an access of disease which I think must be attributed to 

 air infection. 



Dr. J. J. Salisbury of Cleveland, Ohio, made a careful 

 series of experiments on the saliva of numerous residents 

 in a malarial district. 



Amongst the other forms of bacterial life in the saliva 



