IN EXTBA-TROPICAL COUNTRIES. 109 



Mr. Osborne's experiment, initiated by myself, Eucalyptus 

 oils dissolve the following among- other substances for select 

 varnishes and other preparations : camphor, pine resins, 

 mastic, elemi, sandarac, kauri, dammar, asphalt, xanthorrhsea 

 resin, dragon's-blood, benzoe, copal, amber, anime, shellac, 

 caoutchouc, also wax, but not gutta-percha. These substances 

 are arranged here in the order of their greatest solubility. 

 The potash obtainable from the ashes of various Eucalypts' 

 varies from five to twenty-seven per cent. One ton of the 

 fresh foliage of E. globulus yields about 8| Ibs. of pearl ash, a 

 ton of the green wood about 2 Ibs., of dry wood about 

 4i Ibs. For resins, tar, acetic acid, tannin, and other products 

 of many Eucalypts, see various documents and reports of the 

 writer, issued from the Melbourne Botanic Garden. 



Eucalyptus botryoides, Smith. 



From East Gippsland to South Queensland. One of the most 

 stately among an extensive number of species, remarkable for 

 its dark-green shady foliage. It delights on river banks. 

 Stems attain a length of 80 feet without a branch, and a 

 diameter of 8 feet. The timber usually sound to the centre, 

 adapted for water-works, wagons, knees of boats, &c. Posts 

 of it very lasting, as no decay was observed in fourteen 

 years. 



Eucalyptus calophylla, R. Brown. 



South- West Australia, where it is vernacularly known as 

 Red Gum Tree. More umbrageous than most Eucalypts and 

 of comparatively rapid growth. In its native forests it has 

 quite the aspect of the eastern Iron Bark Trees. The wood is 

 free of resin when grown on alluvial land, but not so when 

 produced on stony ranges. It is preferred to that of E. mar- 

 ginata and E. cornuta for rafters, spokes, and fence rails, also 

 used for handles and agricultural implements ; it is strong and 

 light, but not long-lasting underground. The bark is valuable 

 for tanning, as an admixture to Acacia bark ; the seed vessels 

 of this and perhaps all other Eucalypts can be used for the 

 same purpose. The stem of this tree may occasionally be 

 observed 10 feet in diameter; it is the only tree in West 

 Australia which yields copiously the fluid and indurating kino. 



Eucalyptus citriodora, Hooker. 



Queensland. A handsome slender tree with a smooth white 

 bark, supplying a useful timber. According to notes of the 

 late Mr. Thozet, a trunk 40 feet long and 20 inches in diameter 



