CONTENTS OF VOL. XXII. 
NUMBER CXLII.—JANUARY, 1843. A 
age 
Mr. W.G. Armstrong on the Efficacy of Steam as a means of 
producing Electricity, and on a curious Action of a Jet of 
Steam appa Ballade. Wy, ryan eu fd. teihagesii=scnan he: 1 
Sir J. F. W. Herschel on the Action of the Rays of the Solar 
Spectrum on Vegetable Colours, and on some new Photo- 
EDUC | XOGEENCS 92.75. cine iid EAS apseTs pis hich Sesble xin are ben 5 
The Rev. M. O’Brien’s Reply to Professor Kelland’s Observa- 
tions in the Philosophical Magazine for November 1842 ... 2] 
Mr. Earnshaw’s Reply to Professor Kelland’s Letter of No- 
BREA EEN CE 38 cain ies ce yoik oie ALTE AE Aba WO shores bm 22 
Mr. T. S. Davies on the Foci and Directrices of the Line of the 
Be OMMCLTTIPR A ACC ater piste ere ke peers Gee eel sulphide oe 25 
Prof. Grove’s Letter to Mr. R. Phillips on the subject of Pro- 
fessor Daniell’s last Communication............... : 32 
PPEMONANCE SUIVEH ie ots! civicie sb an) bac Sav nveelh W hislnvs © d05e 35 
Mr. W.C. Redfield on the Evidence of a general Whirling Ac- 
ouinethe Providence “Lormado® fr +... /. 0 tteee 1 2 cle ae - 38 
Messrs. W. Francis and T. G. Tilley’s Notices of the Results 
of the Labours of Continental Chemists (continued)........ 52 
Mr. G. G. Stokes “on the Analytical Condition of Rectilinear 
Fluid Motion,” in Reply to Professor Challis............ 55 
Proceedings of the Geological Society..................+. 56 
Curatorship of the Geological Society .................... 73 
BEA TAQUIEGHE MADOUE 9 «(55 Bie ore vats chore eo, + oacis ova. p she 73 
Acetate of Soda containing nine atoms of Water .......... 74 
On the Solubility of Arsenious Acid in Nitric Acid ......... 74 
Action of Solutions of Chlorides and Air on Mercury........ 75 
Difference between the Fusing Points of the same Bodies when 
Crystallized and when Amorphous a os he ee is, LATO 
Equivalents of certain Elementary Bodies, by M. ‘Dumas retina hG 
meaneumarina, by M. Schieb J: sites y-- osteo eso nl oe 77 
Meteorological Observations for November 1842 .......... 79 
Meteorological Observations made at the Apartments of the 
Royal Society by the Assistant Secretary, Mr. Roberton; 
by Mr. Thompson at the Garden of the Horticultural Society 
at Chiswick, near London; by Mr. Veall at Boston; by the 
Rev. W. Dunbar at Applegarth Manse, Dumfries- shire ; and 
by the Rev. C. Clouston at Sandwick Manse, Orkney .... 80 
He 
