Geological Society. ,>^85 



GEOLOGICAL SOCIETY. 



May 2. — A Paper was read On the Geology of Upper 

 Canada. 



A Notice was read On the Discovery of a large fossil 

 Elephant's Tusk, near Charmouth, Dorset ; by H. T. De la 

 Beche, Esq. 



A Paper was read entitled Observations on the Genus Acti- 

 nocamax ; bj^ J. S. Miller, Esq. 



A Paper was read On the Belemnites of the Chalk and Al- 

 luvial Strata of Norfolk and Suffolk, with Notices on their 

 Localities and accompanying Fossils ; by Richard Taylor, Esq. 



May 16. — A Memoir was read On the Geology of Southern 

 Pembrokeshire, from the Observations of H. T. De la Beche, 

 Esq. and the Rev. W. D. Conybeare. Drawn up and communi- 

 cated by the former. This Memoir is accompanied by a Map 

 and extensive sections of the coast. The constituent formations 

 occurring in this district are as follow, beginning with the lower- 

 most: 1st, Trap; 2nd, Greywacke; 3 rcl, Old Red Sandstone; 

 4th, Carboniferous Limestone ; 5th, Coal Measures. 



A Letter was read from Henry Heuland, Esq. For. Sec. G.S., 

 addressed to the President, On the Matrix of the Diamond. 

 In this letter Mr. Heuland describes two specimens, which he 

 laid upon the table of the Society. The first of these, from Ab- 

 baete in Brazil, was a conglomerate of oxide of iron, with small 

 waterworn quartz pebbles, containing a diamond. This, which 

 is called Cascalhao, Mr. Heuland believes to be of alluvial origin. 

 The qther specimen, from Pereira in Brazil, which Mr. Heuland 

 received from Baron d'Eschwege, was a very small brilliant 

 dodecahedral diamond, surrounded by skorodite or cupreous 

 arseniate of iron in a gangue or matrix of massive oxide of iron 

 (Werner's brown iron-stone). This oxide of iron, according to 

 Baron d'Eschwege and Alexander Caldcleugh, Esq., forms 

 veins or beds, 25 feet deep, resting on chlorite schist, in the 

 mountains near Pereira. That it is the true matrix of at least 

 the Brazilian diamond, appears confirmed by the locality where 

 diamonds have not before been discovered, by its being accom- 

 panied by the arseniate of copper, and by the difference of this 

 oxide of iron from that in the Casc&lhao, which is either earthy, 

 granular, or in water-worn particles. 



ROYAL ACADEMY OF SCIENCES OF PAIIIS. 



Feb. 3, 1823. — M. Bosc read, in the name of a Commission, 

 a Report upon the MS. work of M. Delislc, entitled " History 

 of Lichens of the Geiuis Sticta, M. Delisle, of Vire, depart- 



Vol. fJl. No. 301. May 1823. 3 C ment 



