160 Intelligence and Miscellaneous Articles, 



author stated that, at the junction' of the calcareous rock with the 

 granite, the former was often more or less altered ; and this appeared 

 to be the best proof of the Tertiary age of the latter. 



Mr. Lennox then adverted to a diagram-section of the rock- 

 formations of Jamaica by the late Mr. Barrett (Quart. Journ. Geol. 

 Soc. vol. xix. p. 515), which he considered erroneous on the follow- 

 ing grounds: — (1) he knows no section in Jamaica in which the 

 relation of the White Limestone to the Hippurite-limestone is seen ; 



(2) the White Limestone he believes to be of Miocene age ; and 



(3) the shaly and sandy beds represented in the section as overlying 

 the White Limestone he considers to be undoubtedly in infra- 

 position. 



The author then discussed the question of the age of the White 

 Limestone, first on physical grounds, and afterwards palaeontolo- 

 gically, inferring that it was decidedly of Miocene date ; and in 

 conclusion he remarked that the White Limestone had probably 

 been deposited slowly in a tranquil sea, and discussed its relation to 

 the Tertiary beds of the other West Indian Islands. 



4. " Facts and Observations connected with the Earthquake which 

 occurred in England on the morning of the 6th of October, 1863." 

 By Fort-Major T. Austin, F.G.S. 



Earthquakes in the British Isles attract usually but little notice, 

 owing probably to the mild form in which they generally occur ; but 

 the one treated of in this paper, owing to its greater violence, 

 aroused attention to the subject. The disturbance was said to ex- 

 tend from a point in St. George's Channel forty or fifty miles to 

 the north-west of Pembrokeshire to Yorkshire, and the focus of the 

 disturbance to be situated near the former spot. The author 

 brought forward a number of facts for the purpose of proving the 

 intensity of the shock, the time at which it occurred, the number of 

 vibrations, their direction (which was considered to be from "W.N. W. 

 to E.S.E.), and the occurrence of incidental phenomena, and con- 

 cluded by passing in review the natural causes competent to produce 

 these and other characteristics of earthquakes. 



XIX. Intelligence and Miscellaneous Articles. 

 apjohn's 'manual of the metalloids/ 



To the Editors of the Philosophical Magazine and Journal. 



Gentlemen, 

 TTAVING been many years since an occasional, though, I fear, a 

 •*--*■ not very valuable contributor to the pages of the Philosophical 

 Magazine, or rather of its predecessor, the Annals of Philosophy, I 

 trust you will permit me to make a few remarks on the review of my 

 volume on the Metalloids which has appeared in the last Number of 

 your Journal. In these remarks you will, I hope not, find anything 

 uncandid, or exceeding the just limits of scientific discussion. I am 

 quite aware how unreasonable it would be to occupy your pages 

 with a lengthened paper on questions chiefly relating to myself, and 

 shall therefore make my notice of the review as brief as possible. 



