607 
Description of a New Species of Clerodendron from Old Calabar, 
which flowered in 1861 in the Royal Botanic Garden of 
Edinburgh. By John Hutton Balfour, A.M., M.D., &c. 8vo. 
— From the Author. 
Abstract of the Proceedings of the Geological Society of London, 
Nos. 78, 79, 80. — From the Society. , 
Man and his Helpmate. By William Thomas Thomson. Folio. 
From the Author . 
Monthly Return of the Births, Deaths, and Marriages Registered 
in the Eight Principal Towns of Scotland. March 1862. 8vo. 
— From the Registrar- General. 
Monthly Notices of the Royal Astronomical Society. Vol. XXII. 
No. 5. 8vo.— - -From the Society . 
Journal of the Chemical Society. No. LX. 8vo. — From the 
Society. 
Monday , 2 Sth April 1862. 
Professor CHRISTISON, Y.P., in the Chair. 
The following Communications were read : — 
1. Experimental Inquiry into the Laws of the Conduction of 
Heat in Bars, and into the Conducting Power of Wrought 
Iron. By Principal Forbes. 
The experiments described in this paper were all made in 1850 
and 1851, upon a plan which was fully explained by the author in 
letters to Mr Airy and Professor Kelland in the former year. 
Some notice of them appeared in the British Association Reports 
for 1851 and 1852, and the apparatus was supplied by a grant 
from the Association. 
In previous inquiries into the thermal condition of a long con- 
ducting bar heated at one end, two assumptions have always been 
made : First , that the flux of heat across any transverse section of 
the bar is proportional throughout to the rapidity of the decrement 
dv 
of temperature reckoned along the axis of the bar (or to — , where 
doc 
v represents the temperature, above that of surrounding space, of any 
