Is the Eucalyptus a Fever-destroying Tree ? 13 



When does it take place ? 



What is the quantity 1 



What is the probable sanitary effect ? 



Before taking up this question with the above queries, I 

 think it but right (although known to most of the members 

 of this Society) to mention that my operations on the 

 eucalyptus, both as to its solid and volatile contents, for 

 technical and medical purposes, have extended over many 

 years, and that they have been conducted on the living 

 plant in its forests and in the desert scrub during all seasons 

 of the year, and that the apparatus employed operated on 

 four tons of material daily. 



The representative or type species to which I have 

 referred will elucidate the whole question. They are the 

 following eight species : — 



1. Viminalis, or manna gum. 



2. Odorata. 



3. Eostrata, or red gum. 



4. Obliqua, or stringy bark. 



5. Sideroxylon, or iron bark. 



6. Globulus, or blue gum. 



7. Oleosa, or mallee. 



8. Amygdalina, or peppermint. 



The first two — viminalis and odorata — represent those 

 species of the eucalypti which yield a small per centage of 

 volatile oil. 



The four following — the red gum, the stringy bark, the 

 blue gum, and the iron bark — represent those species which 

 gradually increase in per centage of oil until it attains to a 

 fair medium standard ; and the last two — the mallee and the 

 peppermint — are those which represent the maximum. The 

 following is the illustration : — 



Odorata yields 7 fluid ounces from 1000 lbs. weight of 

 fresh- gathered leaves attacked to very small 

 brancklets. 



Viminalis yields the same. 



Eostrata „ 



15 < 



Dunces 





Obliqua ,, 



80 



55 



or 4 pints. 



Globulus „ 



120 



„ 



55 6 „ 



Sideroxylon „ 



160 



5J 



„ 8 „ 



Oleosa „ 



200 



55 



„ 10 „ 



Amygdalina „ 



500 



55 



55 25 „ 



