PHILOSOPHICAL TRANSACTIONS. 
1. On the Ratio of the Specific Heats of the Paraffins, and their Monohalogen 
Derivatives. 
By J. W. Capstick, M.Sc. [Viet.), B.A. [Camh.), Scholar and Coutts-Trotter Student 
of Trinity College, Cambridge. 
Communicated by Professor J. J. Thomson, F.R.S. 
» 
Received May 2.5,—Read .June 15,—Revised Octobei’ 21, 189.3. 
Table of Contents. 
Page. 
§ 1. Introduction. 1 
§ 2. The Kundt apparatus. 7 
§ 3. The vapour density apparatus. 11 
§ 4. Marsh gas.14 
§ 5. Methyl chloride.18 
§ 6. Methyl bromide.21 
§ 7. Methyl iodide.22 
§ 8. Ethane.23 
§ 9. Ethyl chloride.25 
§ 10. Ethyl bromide.28 
§11. Propane.29 
§12. Normal propyl chloride.31 
§ 13. Isopropyl chloride.32 
§ 14. Isopropyl bromide.32 
§ 15. Discussion o£ the results.34 
§ 1. Introduction. 
The experiments to be described in the present paper were undertaken in the hope 
of obtaining data which would throw light on one of the most obscure points of the 
kinetic theory of gases, namely, the distribution of energy in the molecule. 
The properties of gases on which the kinetic theory gained its reputation were the 
constancy of the product of pressure and volume, and the uniformity of the coefficient 
MDCCCXCIV.—A. B 15.2.94 
