198 Notices and Analyses. 



thus proving them to belong to the chalk formation, which Professor 

 Jameson thinks will probably be found in situ in some of the hollows 

 in this part of Scotland. 



Since this period Mr Christie has met with a quantity of flints mixed 

 with the water-worn stones and shingle along the shore of Boyndie 

 Bay, to the westward of Banff, and on the rising ground between 

 TurifF and Delgaty Castle ; and what renders more probable their 

 immediate connection with the chalk formation is, that they also 

 contain organic remains principally of sponges and alcyonia. 



We recollect an old joke about some flints being cast out with ballast 

 near Peterhead ; but this can no longer militate against the Profes- 

 sor's opinion, when these flints, containing organic remains, are found 

 so eitensively disseminated. 



Transactions of the Natural History Society of Northumberland, 

 Durham, and Newcastle-upon-Tyne. Vol. I. Part II. 



This part contains five memoirs ; — I. Remarks on the geology of the 

 banks of the Tweed, from Carham, in Northumberland, to the sea- 

 coast at Berwick, by N. J. V/inch. II. Sketch of the life and 

 works of the late Thomas Bewick, by Mr G. C Atkinson. III. 

 ' ' Description of a gronp of dykes, termed Riders, discovered in the 

 "Whitehaven Colliery, by Mr Williamson Peile. IV. Notice of the 

 edge seams of Mid-Lothian, with a description of Gilmerton 

 colliery now working, the lowest of the series called the North 

 Green Seam ; by Mr Matthias Dunn, Colliery viewer. V. On the 

 "■ted sandstones of Berwickshire, particularly those at the mouth of 



the River Tweed, by Henry Witham, of Lartington, Esq. 

 Of this part, we have made some use, as may be seen by a reference to 

 ' our Geological Collections, and we may probably return to it in a future 

 ,: »iv^ Number. We have to regret, that the coloured lines, red and yellow, 

 referred to in the plan and section, illustrative of Mr Peile's very 

 interesting description of the dykes in the Whitehaven coal-field, 

 have been omitted in our copy, by which the position of the riders is 

 rendered much less intelligible. 

 We have only room to congratulate this zealous society on their 

 success in the geological field, and to wish them a satisfactory con- 

 tinuance of their useful labours. 



Experimental Inquiries on Electrical Accumulation. By Mr 

 W. S. Harris, of Plymouth. Pamphlet, in 8vo. 



From an elaborate series of experiments, detailed in this paper, Mr 

 Harris has deduced the following laws of electrical accumulation and 

 transmission : — 



1. An electrical accumulation may be supposed to proceed by equal 



increments A coated surface, charging in any degree short of 



saturation, receives equal quantities in equal times, all other things 

 remaining the same. — The quantity passing from the outer coating, 

 is always proportional to the quantity added to the inner. 



2. The quantity of matter accumulated may be estimated by the revo- 

 lutions of the plate of the electrical machine, supposing it in a state 

 of uniform excitation ; or it may be measured by the explosions of a 

 jar connected with the outer coatings. — It is as the surface multiplied 

 by the interval which the accumulation can pass. — When the surface 

 is constant, it is as the interval — When the interval is constant, it is 



