XX. ABSTRACT OF PROCEEDINGS. 



(2) That the Second Popular Science Lecture 1904, on 

 "The Fabric of the Universe," by Prof. G. H. Knibbs, 

 f.r.a.s., would — by special request — be repeated in the 

 Physics Lecture Theatre of the University on Friday, 

 August 5th, at 8 p.m. 



(3) That tlie Third Popular Science Lecture 1904, on 

 "The Solar System and Southern Sky," by H. A.Lenehan, 

 f.r.a.s., etc.. Acting Government Astronomer, Sydney 

 Observatory, would be delivered at the Society's House, on 

 Thursday, September 22nd, at 8 p.m. 



Thirty-four volumes, 185 parts, 13 reports, and 8 

 pamphlets, total 210, received as donations since the 

 last meeting, were laid upon the table and acknowledged. 



Till: FOLLOWING PAPERS W T ERE READ. 



1. "On Eucalyptus Kinos, their value for Tinctures, and 

 the Non-Gelatinization of the Product of Certain 

 Species," by Henry G. Smith, f.c.s., Assistant Curator, 

 Technological Museum, Sydney. 



In this paper, which is the second of the series dealing 

 with Eucalyptus kinos, the author shows that the tannins 

 in the exudations from the various Eucalypts vary largely 

 in character, and that while some kinos gelatinize in tinc- 

 tures others do not. There is a remarkable regularity in 

 the action of kinos from allied species, and the marked 

 differences in the tannins themselves appear to be the 

 reason why they act so differently as regards gelatinization. 

 There are three tannins at least in Eucalyptus kinos and 

 all are determinable by reagents. The one which gives 

 the violet coloration and precipitate with ferric chloride 

 gelatinizes the most rapidly, the one giving a green color- 

 ation with ferric chloride also gelatinizes but not so rapidly 

 as the other. The tannin which gives a blue coloration 

 with ferric chloride does not gelatinize in tinctures. The 



