CONTENTS. 
Observations and Experiments concerning-Mr. Davy’s Hypo- 
thesis of Electro-chemical Affinity .. .. 227, 245 
An Analysis of Fluor-Spar .. 6. ew os 258 
On the Gaseous Combinations of Hydrogen csi Berton 260 
On a grand practical Improvemeni in the Harmony of Mu- 
sical Instruments, by the Introduction of the Rev. Henry 
Liston’s Patent ENHARMONIC ORGAN; with the Names 
of the 60 distinct Sounds which it produces in each Octave, 
from 20 Pipes, and their Intervals calculated =... 973 
Experiments on Allanite,.a new Mineral ie Green- 
CaM Os Ne Vee y SUT SAS Vay AURA NO S 
On the Sarcocele of Egy sip’ LO oP os oP el oaBD 
Improvements in the Aquatinta Process, iy Ye which Pen, Pen- 
eth, and Chalk Drawings can be imitated 1... 297 
Method of preparing Ox-Gall in a concentrated State for 
Painters, and for other Uses te BAGO DED TIL ZO1 
A Chemical Analysis of Sodalite, a new Mineral from 
Seem AN 6 ua senet Se? 2 Th eRA osiing BOB 
Mr.Farey’s Reply to Mr, Joun aed on Water Pressure 
Engines for Mines .. .. a Leb aisioaeBOD 
A Taste of the Beats, on Mr. Williarn Hawkes’s Patent 
Organs and Piano-Fortes, calculated ly the Rev. C. J. 
SmytH; and communicated, with some Remarks, by 
Mr. Joun Farry Bern a ot te nt Pee ea et ee 
Description of a New Thrashing Mill .. «2 ... = 393 
On the recent Improvements made in musical keyed Instru- 
ments, with Copies of the Specifications of three Patents 
lately granted for these Purposes, to Mr. Hawkes, Mr. 
Loeschman, agd Mr. Liston. - ... oo: «2 %. 325 
Method of producing Heat, Light, and various useful 
Articles, from Pit-Coal .. .. «1 «2 ++ 332 
Comparative Analysis of the Gum Resins ae Diecast) pee 
Explanation of an Experiment on Tuning, in Reply to a 
Correspondent .. .. «- Poise as G58 
Method of procuring Turpentine ‘ad aller Products from 
See OIC Pig. tag) ae hate hah hci Ben eta HOBO 
