718 
Proceedings of the Royal Society 
observed that, in the case of this letter, possibly the idea of a 
tuned cavity may be true for singing, and that of a constant cavity 
for speech. 
7. On the Electric Conductivity of the Bars employed in his 
Measurements of Thermal Conductivity. By Prof. Tait. 
The following Gentleman was duly elected a Fellow of the 
Society : — 
Dr J. J. Kirk Duncanson, 8 Torphichen Street. 
Monday , Vlth June 1878. 
Sir WYYILLE THOMSON, Vice-President, in the Chair. 
The following Communications were read : — 
1. On the Biliary Secretion, with Reference to the Action 
of Cholagogues. Part II. By Professor Rutherford, 
F.R.S.S, L. and E., and M. Vignal. 
(Abstract.) 
The method of experiment hy which the following results have 
been obtained has been described in the abstract of Part I., pub- 
lished in the “Proceedings” February 1877. All the experiments 
were performed on dogs. In the previous abstract the effects of 29 
different substances were briefly stated : — 
30. Dilute nitro-hydrochloric acid is a hepatic stimulant of consi- 
derable power. 
31. Jaborandi is a very feeble hepatic stimulant. 
32. Calabar bean stimulates the liver, but not powerfully, unless 
it be given in very large doses. 
33. Atropia sulphate antagonises the effect of Calabar bean on 
the liver, and thus reduces the hypersecretion of bile produced by 
that substance. It does not, however, arrest the biliary secretion ; 
and when given alone, does not notably affect it. 
34. “ Menispermin,” a resinous matter obtained from the Yellow 
