Royal Society, 57 



The stains were of a lighter tint than the stone, and the 

 general appearance was as if a pail of some light-coloured 

 fluid had been dashed over the floor, so as to produce various 

 distinct streams. All along the course of the discharge, and 

 particularly in the neighbourhood of the bell-wires, there were 

 small holes in the wall about an inch deep, like the marks 

 that might be made by a finger in soft plaster. 



" Most of the windows were shattered, and all the frag- 

 ments of glass were on the outside. I suppose this must be 

 accounted for by the expansion of the air within the house. 



" The window-blind of the staircase, which was down at 

 the time, was riddled, as if with small shot. The diameter 

 of the space so riddled was about a foot. On minute exami- 

 nation I found that the holes were not such as could readily 

 be made by a pointed instrument or a pallet. They were 

 angular, the cloth being torn along both the warp and the 

 woof. 



"The house was shattered from top to bottom. Two of the 

 servant maids received a positive shock, but soon recovered. 

 A strong smell of what was supposed to be sulphur, was per- 

 ceived throughout the house, but particularly in the bed- 

 room, in which the effects I described before took place." 



VI. Proceedings of Learned Societies. 



ROYAL SOCIETY. 



[Continued from vol. xxxvi. p. 549.] 



Feb. 7, " f\ N the development and homologies of the Molar Teeth 

 1 850. ^-^ of the Wart-Hogs (Phacochasrus), with illustrations 

 of a System of Notation for the Teeth in the Class Mammalia." 

 By Richard Owen, Esq., F.R.S. &c. 



The author commences by a brief statement of the facts and con- 

 clusions recorded in a paper by Sir Ev. Home on the dentition of 

 the Sus JEthiopicus, in the Philosophical Transactions for 1799, 

 p. 256 ; and gives the results of an examination of the original 

 specimens described and figured by Home, and of other specimens 

 showing earlier stages of dentition, which lead to the following 

 conclusions as to the number, kinds, and mode of succession of 

 the teeth in the genus Phacochcerus. The tooth answering to the 

 first milk- molar and first premolar in the upper jaw, and those 

 answering to the first and second milk-molars and corresponding 

 premolars in the lower jaw of the common Hog are not developed. 

 Eight successive phases of development of the grinding teeth of the 

 African Wart-hogs are described and expressed by the following 

 notation : — 



