1909-1910.] 



243 



Types of Basalt in Co. Antrim," in which he suggested a 

 classification based primarily according to their varying basicity. 



Mr. Joseph Wright gave a most instructive Demonstration on 

 " Foraminifera " on 15th December, and Mr. Maxwell a very 

 interesting one on "The Diatomace?e " on 26th January. These 

 demonstrations were fully illustrated by specimens, microscopic 

 slides, &c. On the latter evening Mr. Robert Bell showed a 

 specimen of Cardinia scutula (Brown) from A. angulatus zone, 

 Lower Lias, Waterloo, Lame. 



In February Mr. Tomlinson gave a full and suggestive paper 

 on the " Geology of Weymouth and the Coast of Dorset," 

 illustrated by lantern slides and specimens of the rocks and fossils 

 of the district. Mr. Wear on the same evening showed two slides 

 of Scawt Hill Volcanic neck. 



The last paper of the session was given on 23rd March by 

 Mr. Strachan on " The Chalcedony of Ballyboland, Co. Antrim," 

 in which he gave reasons for supposing that the chalcedony and 

 the purple basalt in which it occurs were magmatic separations, 

 rather than solfataric alteration products. 



During the winter an interesting series of lectures on practical 

 Petrology was delivered to Members of our Field Club by Dr. 

 A. R. Dwerryhouse, F.G.S., Lecturer on Geology in the Queen's 

 University. These dealt with the identification of minerals by 

 means of the microscope, and with the classification of rocks. 

 Each lecture was followed by a demonstration class. By kind 

 permission of the Vice-Chancellor, the lectures were given in the 

 Geological Department of the University. 



A few additions have been made to our collection of 

 Microscopic Sections, including slides illustrative of a recent 

 ferruginous deposit caused by iron-bacteria (Cladothrix) from Six- 

 Mile-Water Valley, presented by Mr. James Strachan. 



We are also indebted to Mr. Wm. Christy for a fine specimen 

 of pseudomorphs of rock-salt from the Trias at the Forth River, 

 Belfast. 



