1 42 EUCAL YPTUS. 



or in fumes from burning. I have, in central Egypt, 

 killed the flies in a large room every night to prevent 

 their early morning buzzing. I did this by closing it 

 after sunset and burning pyretherium. The room was 

 then reopened to get rid of the smell. Every fly was 

 killed. Still, here in California, I have repeatedly failed 

 to kill insects with this powder. On examining the pow- 

 der, or rather having it examined for me, I discovered 

 that it was adulterated, and, in several samples, con- 

 tained no pyretherium whatever. 



Differing results by experimenters with other agents 

 may be due to a similar cause. 



We use tobacco infusion against scale insects success- 

 fully, and could probably use one made from Eucalyptus 

 leaves with equal effect. 



I have a rain water cistern at my house which re- 

 ceives its supply trom a roof on which Eucalyptus leaves 

 are constantly falling, thence being washed into the cis- 

 tern. From this cause the rain water has a slight 

 amber tint and a scarcely perceptible Eucalyptus odor. 

 This water never has had the disagreeable smell that occurs 

 usually in rain water shortly after it is stored, and 

 which afterwards disappears. 



We have here a long dry season during which the water 

 in the cistern would have ample opportunities to go through 

 what is called in Louisiana "curing." 



This curing I presume is really a process of fermenta- 

 tion of matter carried down with the precipitated rain 

 water from the air. 



I know no other rain water tank here, so that I am un- 

 able to learn in the same air conditions what would happen 

 to rain water without Eucalyptus leaves. 



