IV 
CONTENTS. 
Page 
Mr. P. J. Martin on a remarkable Fall of Hail ; with Observa- 
tions on the probable Nature of such Phenomena . . 85 
Mr. J. W. Gutch’s Notice of certain Meteorological Phseno- 
mena observed at Swansea 87 
Mr. Ivory (The Bakerian Lecture) on the Theory of the Astro- 
nomical Refractions {concluded) 89 
Prof. Forbes’s Letter to Richard Taylor, Esq., with reference to 
two Papers in the Philosophical Magazine for January, 1840 102 
Mr. Gulliver’s Observations on the Blood Corpuscles, or Red 
Particles of the Mammiferous Animals. No. II 105 
Mr.T. Hawkins on Galvanic Series formed of Zinc and Inactive 
Iron 115 
Mr. W. S. Harris on Lightning Conductors, and the Effects of 
Lightning on Her Majesty’s Ship Rodney, and certain other 
Ships of the British Navy, being a further examination of 
Mr. Sturgeon’s Memoir on Marine Lightning Conductors. . 116 
Dr. Kane on a new Compound of Ferrocyanide of Potassium 
with Cyanide of Mercury 128 
Th. Scheerer on the Decomposition of the Neutral Sulphate of 
the Peroxide of Iron by boiling its Solution 130 
Prof. Sylvester’s Method’ of determining by mere Inspection 
the derivatives from two Equations of any degree 132 
Mr. Halliwell’s New Researches on the true nature of the 
Boetian Contractions, especially with reference to the Ex- 
planation given by M. Chasles 136 
Mr. R. Hunt on the Permeability of various bodies to the Che- 
mical Rays 138 
Mr. M. Roberts on an anomalous Electric Condition of Iron. . 142 
New Books : — Curtis’s British Entomology 144 
% Proceedings of the Geological Society 144 
Royal Astronomical Society 148 
Theory of Substitutions — Acetic and Chloroacetic Acids .... 152 
Myronin, Myronic Acid — Essential Oil of Mustard 153 
Polychromatic Acid 154 
Cyanil 154 
Action of Albumen on Metallic Salts 154 
Haydenite 155 
Beaumontite, a new Mineral. 156 
An Account of the Experiment proposed by M. Arago as a 
Test of the accuracy of the undulatory Hypothesis of Light 157 
Meteorological Observations for December 1839 159 
Table 160 
NUMBER CIL— MARCH. 
Mr. R. Griffith on the true Order of Succession of the Older 
Stratified Rocks in the Neighbourhood of Killarney and to 
tlic Nortli of Dublin 161 
