i CONTENTS. 
Account of a new Method of Bleaching Cotton. By os 
-CuapraL, Member of the National Infitute Page 35% 
On the Method of preparing Inks that will withfland the 
Agiion of the Oxygenated Muriatic Acid. By A. Bosse, 
of Hamburgh - - - - 353 
- Sketch of the Hifiory of Mining in Devon and Cornwall. By 
Mr. Joun Tayior jun. Miner, Taviflock.  Communi- 
cated by the Author. - - - 357 
On the relative Proportions of Coals and Iron-Stones wfed at 
the Blaft-Furnace, and of their proper Application to Ufe. 
By Mr. Davip Musuert, of the Clyde Iron-Works. 
Communicated by the Author - - 366 
A new Theory, pointing out the Situation of the Magnetic 
' Poles, and a Method of difcovering the Lorigitude. By 
P.R. Nucent, E/q. formerly Surveyor-General of Lands 
for the Ifland of Cape Breton. Communicated by the Author 
378 
Defeription of a Portable Machine for loading and unloading 
Goods. By Mr. Georce Davis, of Windfor, Berks 
392 
Defcription of a cheap and efficacious Ventilator for preferving 
Corn on Ship-board. By Tuomas SoutH, E/q. 393 
Intelligence and Mifcellaneous Articles 95, 197, 296, 402 
THE 
