ON SOME N.8.W. TAN-SUBSTANCES. 197' 



Particulars of the trees whence they were obtained — Height 



100 to 120 feet, diameter 3 to 4 feet. 

 Collected 10th August, 1886. Analysed : Bark, 19th August 



to 29th September, 1887 ; Kino, 12th to 29th September, 



1887. 



44. Bark. — This characteristic and well-known bark is some- 

 what similar in appearance to that of E. viminalis, var. The thin 

 smooth, outer bark is dark purplish-brown to chocolate. When 

 this peels off in patches (by the operation producing the spotted 

 appearance), the fresh surface is bright yellow, which weathers 

 into light greys of all tints. The inner bark is of a dark reddish- 

 brown, in some instances, yellowish, brown in others, and full of 

 poor fibre. Average thickness of bark f inch. Colour of powder 

 same as that of E. corymbosa bark, with a yellowish tint added. 



Extract, — Yields 20-865 per cent, to water at 100° C. Solution 

 of a rich ruby colour. Colour of moist residue light reddish-brown. 

 Kino-tannic acid — 9*74 per cent. 



45. Kino. — This is probably the most interesting of all the 

 Eucalyptus Kinos, and I hope to be able to present a full chemical 

 examination of it on a subsequent occasion. It has a comparatively 

 low melting-point, the lowest, I believe, of our kinos. The 

 melting point is scarcely higher, if at all, than that of 

 commercial aloes. . One of the most friable of all kinos, perhaps 

 ranking only second to E. corymbosa in this respect. This friability 

 is assisted by its porous nature, some of it being nearly as 

 porous as pumice, and distinctly vesicular to the eye. It is of 

 a yellowish-brown (to liver) colour, and dull in appearance, except 

 at fresh fractures. When quite fresh it is of a reddish-brown 

 colour, with rather a bright fracture. The sample now under 

 examination yielded a powder of a colour rather darker than 

 yellow ochre. It tends to aggregate. 



Extract. — This kino yields 93-13 per cent, to water at 100° C. 



Mr. Staiger, in the Catalogue of Queensland Timbers at the 

 Colonial and Indian Exhibition, 1886, says, " This kino is soluble 

 in boiling water to the extent of 60 per cent." 



It yields 81-9 per cent, to water at 60° F., and is excessively 

 tedious to dissolve at this low temperature. It leaves a dark 

 resinous residue. A paper on this kino by E. Norton Grimwade, 

 will be found in the "Pharmaceutical Journal " of the 26th June, 

 1886 : — "The kino operated upon contained much foreign matter, 

 such as bark, quartz, &c. The best solvent proved to be rectified 

 spirit, which dissolved about 80-85 of the crude gum. By the 

 action of cold water about 18*9 per cent, was dissolved. Warm 

 water was found to extract a slightly higher percentage, but the 

 solution became turbid on cooling." This differs from Mr. Staiger's 



