Remarks on the Analysis of Spring and Mineral Waters. 291 
the head of the former. The number expressing the size of the 
shot, the weight of the charge, and the diameter of the barrel for 
which they are intended, are then marked on the cartridge thus: 
---. 4.e. No.4 shot 2! oz. for barrel *72 diameter. This is 
----'| essential, as some cartridges remain in stock many years, 
and, although promiscuously mixed together, are easily 
separated. 
If the above occupies too much space to be admitted 
at length, please to make such extracts as you think fit. 
While on the subject of fowling-pieces, I beg leave to remark, 
that although numerous excellent sporting guns are produced ; 
yet no scientific principle has been laid down, on which to pro- 
ceed with a certainty of obtaining this desirable end. From a 
variety of experiments, I am induced to believe there is a certain 
ratio between the length of the barrel and diameter of the bore, 
which gives the maximum of perfection. Perhaps some of your 
scientific readers will favour the public with some observations on 
this subject. I am, sir, your obedient servant, 
Old Ford, Oct. 12. 182}. Jos, STEEVENS. 
ss h Lrg. /. 
o,— 
Section of the Former. 
LXVII.. Remarks tending to facilitate the Analysis of Sprin 
and Mineral Waters. By Joun Datton*. age 
I. cannot but fall under the observation of every one, that the 
health and comfort of families, and the conveniences of domestic 
life, are materially affected by the supply of that most necessary 
article, water. The quality of water is undoubtedly of great im- 
portance in the arts of brewing, baking, and various others con- 
ifected with the preparation of food; as also in the washing and 
* From the Memoirs of the Literary and Philosophical Society of Man- 
chester, 
Oo2 bleaching 
