74 
3'6 e.c. FeS04=100 c.c. of permanganate solution (5 c.c. 
permanganate solution = ‘0004 oxygen). 
3’6 c.c. FeS04= ‘0004 x 20= ’008 oxygen. 
20 c.c. ,, = — ^ = 0 04444 &c. oxygen 
or 9 ’3824 grains of carbon per gallon. 
(h) By the lime-water method and distillation. 
50 c.c. lime-water = 50 c.c. standard oxalic acid. 
1 c.c. oxalic acid solution = -001 CO2. 
2S0 c.c. of the Devizes sewage-water taken. 
Took 200 c.c. lime-water altogether and titrated back 
with 72 c.c. oxalic acid solution. 
128 c.c. of lime-water used. 
128 c.c. = 0-128 CO2. 
= 9-72 grains of carbon per gallon. 
This contained a little carbon present as carbonate. 
Sale, Cheshire, sample of sewage water. 
Chromic acid process. 
By lime-water method 0-1444 grains C. 
ByFeS04 0-1487 „ C. 
Ordinary Meeting, January 11th, 1887. 
Professor OsBORNE Eeynolds, LL.D., F.KS., Vice-President, 
in the Chair. 
The Chairman announced that the Secretaries had re- 
ceived a letter from Mr. R. D. Darbishire, B.A., F.G.S., 
expressing his wish to resign the office of President of the 
Society. The letter will be submitted to an Extraordinary 
General Meeting. 
“ On a Comparison of Drawings and Photographs of Sun- 
spots, and the sun’s surface,” by A. Brothers, F.R.A.S. 
The receipt, a few days since, from Mons. J. Janssen, of 
