Intelligence and Miscellaneous Articles, 295 



2. " The Gold-leads of Nova Scotia." By Henry S. Poole, Esq., 

 M.A., F.G.S., Government Inspector of Mines. 



The author remarked upon the peculiarity that the gold-leads 

 of Nova Scotia are generally conformable with the beds in which 

 they occur, whence Dr. Sterry Hunt and others have come to the 

 conclusion that these auriferous quartz veins are interstratined with 

 the argillaceous rocks of the district. With this view he does not 

 agree. He classified the leads in these groups according to their 

 relations to the containing rocks, and detailed the results of mining- 

 experience in the district, as showing the leads to be true veins by 

 the following characters : — 1. Irregularity of planes of contact 

 between slate and quartz ; 2. The crushed state of the slate on some 

 foot- walls; 3. Irregularity of mineral contents ; 4. The termination 

 of the leads ; 5. The effects of contemporary dislocations ; 6. The 

 influence of strings and offshoots on the richness of leads. The 

 author further treated of the relative age of the leads and granite, 

 and combated the view that the granites are of metamorphic origin, 

 which he stated to be disproved by a study of the lines of contact. 

 He also noticed the effects of glaciation on the leads, and the 

 occurrence of gold in Carboniferous conglomerate. 



3. " On Conodonts from the Chazy and Cincinnati groups of the 

 Cambro-Silurian, aud from the Hamilton and Genesee-Shale divi- 

 sions of the Devonian, in Canada and the United States." By 

 G. Jennings Hinde, Esq., E.G.S. 



4. " On Annelid Jaws from the Cambro-Silurian, Silurian, and 

 Devonian Formations in Canada, and from the Lower Carboniferous 

 in Scotland." By G. Jennings Hinde, Esq., F.G.S. 



XL VII. Intelligence and Miscellaneous Articles. 



ON THE DIFFUSION OF LIQUIDS. BY J. STEFAN. 

 rPHIS memoir contains the calculation of Graham's experiments, 

 -*- which were published in the ' Philosophical Transactions,' 1861, 

 p. 183. To commence the experiment, on the top of 100 cub. centims. 

 of a salt- solution in a cylindrical vessel 700 cub. centims. of 

 water was poured. After a fixed time the liquid was, by means of 

 a fine siphon, drawn off at the top in portions of 50 cub. centims. 

 each, and the salt-content of each of the fourteen upper layers 

 separately, the two lowermost together, determined. The amount 

 of salt contained in the original solution was always 10 grams. 



The solution, corresponding to this arrangement of the experi- 

 ment, of the differential equation constructed by Fourier for cal- 

 culating the propagation of heat through conductors, and applied 

 by Fick to the representation . of the laws of diffusion, can be 

 effected in two ways : — First, in the form of periodic series. This 

 form is ill-suited to the discussion of the experiments, since, except 

 in a few cases, very many terms of the series must be taken for 

 the calculation. 



The second method of solution is used in the form of definite 

 integrals ; and for them proper Tables are calculated. The heads 



