519 



density determinations contained in this paper, and more especially 

 in those " On some of the products of the Destructive Distillation of 

 Boghead Coal," the author has so repeatedly had to ascertain the 



value of the expression - nrw^T' *^ at ^ e was m( * uce d to ca lcu- 

 1 ~|~ U' 



late it once for all for each degree of the Centigrade thermometer from 

 1 to 150. As it is always easy so to manipulate as to prevent the 

 value of T falling between the whole numbers, the Table proved a 

 most valuable means of saving time ; the author has therefore appended 

 it to his paper in the hope of its proving equally useful to other work- 

 ing chemists. 



V. "On the Thermal Effects of Fluids in Motion Tempera- 

 ture of Bodies moving in Air." By J. P. JOULE, LL.D., 

 F.R.S., and Professor W. THOMSON, LL.D., F.R.S. 

 Received June 21, 1860. 



(Abstract.) 



An abstract of a great part of the present paper has appeared in 

 the * Proceedings/ vol. viii. p. 556. To the experiments then adduced 

 a large number have since been added, which have been made by 

 whirling thermometers and thermo-electric junctions in the air. The 

 result shows that at high velocities the thermal effect is proportional 

 to the square of the velocity, the rise of temperature of the whirled 

 body being evidently that due to the communication of the velocity 

 to a constantly renewed film of air. With very small velocities of 

 bodies of large surface, the thermal effect was very greatly increased 

 by that kind of fluid friction the effect of which on the motion of 

 pendulums has been investigated by Professor Stokes. 



VI. " On the Distribution of Nerves to the Elementary Fibres 

 of Striped Muscle." By LIONEL S. BEALE, M.B., F.R.S., 

 Professor of Physiology and of General and Morbid Ana- 

 tomy in King's College, London, and Physician to King's 

 College Hospital. Received June 19, 1860. 



(Abstract.) 

 After alluding to the general opinions entertained with respect to 



