157 
far as we know this medical agent, when constantly inhaled, 
has no unfavonrable effect, a result not very usual ; but it is 
difficult to compare it with others, because in no cases can 
we take medicine in doses so minute, constant, and equable. 
There is room here for a very interesting inquiry. 
One virtue claimed for the tree is not so clear — namely, 
its drying up of swamps. This has been accounted for by 
its wonderful rapidity of growth ; but I do not hear that it 
requires wet ground to grow upon, and am told that it grows 
in Australia in very dry places. 
M. Bosisto mentions cool refreshing draughts of water 
obtained from the trunk of the dwarf trees in the region of 
the river Murray. Still one would be glad to hear more on 
this point. These dwarfs are only 25 feet high. 
A paper read before the Royal Society of Victoria by 
1. Bosisto shews a great variation in the amount of oil. He 
says the Euc. Odorata yields 7 fluid ounces from 2000 lbs. 
of leaves attached to small branch! ets. 
Viminalis 
Rostrata 
Oblioua 
Globulus 
Sideroxylon 
160. 
Oleosa 
200. 
Amygdalina 
500. 
I suppose these numbers to represent the total amount of 
oils and resins. 
In a report on the strength of wood, published by the 
Science and Art Department, Kensington, the Eucalyptus 
stands high, but as there are several species from several 
situations the numbers vary considerably. 
In a list where the highest breaking weight is 11,158 lbs. 
in the case of white or pale iron bark, the blue gum of 
N.S. Wales is 7,364 to 6,860, of Queensland 5,663, 4,074, 
3,416, and as a means of comparison, may be given Russian 
