134 
Mr. John Barrow read the following note "On a Com- 
parative Analysis of English and Aleppo Galls.” 
When Mr. Sidebotham brought before the notice of this 
Section the subject of the large increase in the production of 
galls upon the oaks of this country, he expressed a' wish 
that some member would make an analysis of them so as 
to confirm his experiments as to their value. 
I requested Mr. Watson Smith, F.C.S., who is at present 
engaged in my laboratory, to undertake this task, and have 
pleasure in submitting to the Section his results. In order 
to make the analysis of practical value I suggested to him 
that he should examine both the English and Aleppo galls, 
and he has therefore experimented on the best sample of 
Aleppo galls I could procure, and English galls obtained 
fresh from Cheshire. 
The process used in both cases was that of Pelouze, viz. 
by crushing with ether; and although this process is not 
absolutely accurate, it is the best one that Mr. Smith or 
myself could discover. 
The results are 
Aleppo Galls. 
English Galls. 
Gallo-Tannic acid 
..... 61-65 .. 
.... 26-71 
Gallic acid 
.... 1-60 .. 
Woody fibre 
..... 15-68 .. 
.... 47-88 
Water 
..... 12-32 .. 
.... 20-61 
Colouring matter and loss. 
..... 8-75 .. 
100-00 
ft—* 
o 
O 
o ob 
o o 
Probably more gallic acid would be found if the galls had 
been gathered a longer time. 
This analysis confirms Mr. Sidebotham’s opinion of the 
value of the English galls, but does not make them quite as 
valuable as he puts them. 
