ESTIMATION OP NITROUS ETHER IN SPIRIT OF NITRE. 
57 
BEGISTEKED APPBENTICES AND STUDENTS. 
Name. 
Residing with 
Address. 
Brasted, Alfred Ernest . 
..Mr. Hyslop. 
Colchester, Wm. Markham, jun. 
..Mr. Colchester .. 
Forster, Henry. 
..Mr. Sarsfield . 
Griffiths, Edwin Harpham. 
..Mr. Holmes . 
Humphreys, John . 
..Mr. Earee . 
Rigby, James ...: . 
..Mr. Barber. 
Tavernor, Francis . 
..Mr. Medley. 
Vincent, Philip . 
..Mr. Vincent . 
Wincles, William C. 
..Mr. Bing. 
ERRATA IN LIST OP MEMRERS, ETC., JULY, 1866. 
Honorary Members: after Warington, Kobert, insert F.K.S. 
„ after Wiirtz, Charles Adolphe, M.D., insert F.K.S. 
In the List of Country Members the following name was omitted:— 
1861... 638...*Edwards, William.. .Shrewsbury. 
In the List of Registered Apprentices and Students:— 
For Saul, WilliamW....Mr. Prior...Oxford, read Saul, William B....Mr. Pring...Taunton 
In the List of Local Secretaries:— 
For Carnarvon, Owen, Griffith, read Carnarvon, Griffith, Robert. 
BENEVOLENT FUND. 
Subscriptions eeceiyed during July :— 
ertford, H. G. 
Leamington, Pullin, Wm. H... 
Liverpool^ Hunt, Thomas. 
Country. 
£ 
s. 
d. 
£ 
s. 
d. 
0 
10 
6 
Nottingham, Jenkins, Joseph. 
0 
10 
6 
0 
5 
0 
Pontypool, Wood, William ... 
0 
5 
0 
0 
10 
6 
Rotherham^ EUinor, George... 
0 
10 
6 
London. 
Hodgson, William Henry, 199, 
Fleet Street . 
( Pidduck, John, Harrow Road 0 10 
0 10 6 I Pratt, Edm., 49, Berners St. . 0 10 
6 
6 
ORIGINAL AND EXTRACTED ARTICLES. 
COLORIMETRIC METHOD EOE THE ESTIMATION OF NITROUS 
ETHER IN SPIRIT OF NITRE. 
by MR. JOHN T.* MILLER. 
Dissolve 200 grains of thin sheet copper in diluted nitric acid, and evaporate 
the mixture at a gentle heat nearly to dryness. Add 4 or 5 ounces of water, 
and drop in solution of soda or potash until the liquor becomes slightly turbid j 
then add 60 grains of crystallized acetate of soda, and sufficient water to make 
up the quantity to 10 fluid ounces. Set aside for a few hours, and filter. - 
The blue colour of this liquor is changed to green by the addition of a certain 
amount of nitrite of ethyl. When less than this is added, the resulting colour 
is a mixture of blue and green, the shade depending on the quantity of nitrite 
present. 
