EUCALYPTI'S. i 37 



titation for preventing all forms of malaria that one of its 

 species, the Eucalyptus globulus, was widely known as the 

 "fever tree." The facts in regard to this matter are not 

 in a reliable condition. We may put what we know in 

 condensed form as follows: 



Malaria is either mild or absent in Central and Southern 

 Australia and in Tasmania. 



Malaria seems entirely absent in the native haunts of 

 Eucalyptus globulus, Eucalyptus urnigera, Eucalyptus 

 coccifera, Eucalyptus amygdalina, Eucalyptus diversicolor, 

 Eucalyptus -calophylla, Eucalyptus leucoxylon, and other 

 less important species. 



This point is not reliably ascertained, but it is approxi- 

 mately as stated. Its value is not as great as might appear. 



There is about the same absence of malaria in New 

 Zealand where the Eucalyptus has no native representative. 

 The disease is absent in the Scotch heathered hills, in the 

 red wood districts of California, in the pine, cedar and 

 sequoia forests of the Sierra Nevada, in the pine and spruce 

 forests of the Sierra Madre of Los Angeles, and in the chap- 

 "parral of the coast counties of California. Southern Cali- 

 fornia has practically no malaria a happy exemption that 

 might be attributed in one place to various artemisia, in 

 another to grease wood, in another to the giant Mojave 

 cactus, and perhaps most agreeably to the red live oak. 

 The cause of our Coast California general exemption from 

 malaria must be due mainly to the fact that the nights are 

 too cool for the life history of the malarial bacillus. A 

 similar temperature inhibition exists in Tasmania and in 

 the mountains of Australia. There are surely enough 

 undrained, swampy and sour lands here, known locally as 



