Ci cO) Nek a ty NES. 
1. OF the Strength of Acids, and the Proportion of In- 
gredients in Neutral Salts. By Richard Kirwan, E/q;. 
F.R.S. and M. RI. A: - - - Page: 3° 
Il. Chemical Communications and Inquiries. By Robert 
Perceval, M.D. and M.R.L 4. - - 3 85. 
Ill. nu Account of a Chamber Lamp Furnace. By Robert 
Perceval, M.D. and M.R. LA. - - - gl 
IV. Lxtrad& of a Letter from the Rev. Charles Perceval 
to Robert Perceval, M. D, and M. R.I. A. - - 97° 
V. Defcription of a Portable Barometer. By the Rev. 
Gilbert Auftin, A. M. and M.'R.1. A. - - 99 
VI. Obfervations on the Variation of the Needle. By Mr.. 
Thomas Harding, M.R. I. A. - - - 107: 
VII. Deferipiion of an Inftrument for performing the Opera- 
tion of Trepanning. By Samuel Croker King, E/q; 
Member of the Royal College of Surgeons in Ireland, 
and M.R. 1. A. - - - - - r19 
*Ba VIL 
