156 Intelligence and Miscellaneous Articles. 
de Gador on the north side of the Sierra Nevada, passing towards 
the west into the light-coloured limestones of Gibraltar. ‘These are 
probably of jurassic age, are much altered, and traversed by fissures 
containing enormous deposits of galena. ‘The red marble of San 
Anton, probably of cretaceous age, was next noticed. A peculiar cal- 
careous breccia, reposing on the jurassic and cretaceous rocks, near 
Malaga, is at the base of the tertiary series; on it lies a hard lime- 
stone of oolitic structure, with which is associated a compact rock 
of the nummulitic series, formed of Alveolina, Orbitoides, &c. The 
vpper tertiary formation consists of the Tejares beds,—comprising, 
Ist. (lowest) blue clay loaded with univalve and bivalve shells, and 
exceedingly rich in oraminifera ; 2. Marly sands, with land, fresh- 
water, and rolled fossils; 3. Coarse gravel, with sands, abounding 
in Pectens, Oysters, and some other shells, and occurring in the 
Caleta river-bed. Of later age than the above, are the raised beaches 
along the coast-line between Malaga and Almeria. 
XVII. Intelligence and Miscellaneous Articles. 
ON SOME SPECIAL LAWS OF ELECTRICAL FORCE. 
To the Editors of the Philosophical Magazine and Journal. 
GENTLEMEN, 
T is not without regret that I am led to offer a few remarks 
on the several notices of my papers on electricity by Professor 
Thomson and other writers, which have from time to time ap- 
peared in the Philjosophical Magazine. In the first place, I observe 
(Phil. Mag. vol. viii. p. 42) Mr. Thomson states, that Dr. Faraday 
and myself have undertaken researches with a view of invalida- 
ting the theory of Coulomb,—certainly a gratuitous and unproved 
assumption to begin with. ‘Then the experimental result I ob- 
tained, FaQ2, is represented as having been adduced by me in 
opposition to the theory ; and the Report made to the British Asso- 
ciation in 1837, by the Rev. Dr. Whewell, is referred to in sup- 
port of Mr. Thomson’s views. In this Report I am represented as 
having been surprised at finding the force to be as the square of the 
quantity ; and in another place, Hist. of Induct. Sciences, vol. iii. 
p- 28, new edition, it is said that I considered the result as “ inex- 
plicable.” Now if Mr. Thomson or the Rev. Dr. Whewell, for 
whom I must ever entertain the greatest regard and respect, will be 
so good as to point out where in any of my works even the shadow 
of all this is to be found, I should feel myself very greatly obliged. 
So far from having been surprised at the result, or considering it in- 
explicable, I distinc tly say in my paper in the Philosophical Transac- 
tions for 1834, referred to by Mr. Thomson, p. 226, that “I do not 
advert to these experiments as containing any unexpected results, 
but rather in explanation of particular methods of research,” &c. ; 
and at page 236 I refer the law in question to electrical induction 
upon the attracted disc, &c., being just what Mr. Thomson has been 
so obliging as to repeat, virtually ‘in as many words, and with a view 
of exposing the delusion he assumes I labour under in regard to the 
