393 



100-00 



Tannic acid determination (Lowenthal), 34 539 per cent. This 

 kino was analysed November, 1888. 



The catechin and tannic acid in these kinos were determined 

 together by extraction with alcohol. The tannic acid was 

 separately determined by Lowenthal's process (on an original 

 aqueous solution). I cannot go further, in this place, into the 

 chemical questions involved; this will be dealt with in a mono- 

 graph on the whole subject of kinos. I may mention, however, 

 that Lowenthal's process is only of limited application in the 

 determination of tannic acid in turbid kinos, and the figures 

 given in this paper of Lowenthal determinations have comparative 

 values only. For medicinal or tanning purposes, the results 

 obtained by Lowenthal's method will be a guide as far as practical 

 astringent value is concerned. 



No. 36. "Box." Dromedary Mountain, Tilba Tilba, N.S.W. ; 

 collected September, 1889, from trees 80-120 feet in height, and 

 with a diameter of 2-4 feet. 



This kino resembles the previous one so closely that no second 

 description is necessary. 



No. 37. Sample from Wagga Wagga, N.S.W. ; collected October, 

 1889. Tree known locally as " Grey Box." 



Collected and presented by Mr. J. J. Fletcher, M.A., B. Sc, 

 Director of this Society, who described its appearance as like a 

 boss, and that it had thrust up the bark of the tree as if it had 

 been so much paper. The sample principally consists of a large 

 oval mass, over an inch in thickness; it had solidified in this shape 

 while adherent to the bark ; externally it is of a dull brown 

 colour ; on the freshly fractured surface it is bright in appearance. 



