3 74 An A ccount of the Excursions ( 1 9 1 1 ). [Sess. 



It may be of interest to some of our members to learn that 

 I found here this summer the remarkable Sulphur Bacterium, 

 Hillhousia mirabilis West & Griffiths, first described by Prof. 

 G. S. West in the ' Proceedings of the Royal Society,' series B., 

 vol. Ixxxi. (1909). This giant among the unicellular bacteria 

 measures about 60jux26ju. I found it in quantity in the 

 mud of the loch. I had observed it previously in a gathering 

 from Longniddry sent to me by our member, Mr F. Wallis. 



At this meeting Mr T. Cuthbert Day read a paper on " The 

 Intrusive Kocks of Aberdour," illustrated by lantern slides. 

 He also showed slides of views of the Caledonian Forest, 

 Dalkeith Park ; while Mr John Lindsay gave additional views 



of The Haining, Selkirk. 



AN ACCOUNT OF TEE EXCURSIONS {1911), 



By The President. 



The first field meeting this season was a joint geological 

 excursion with the Dunfermline Naturalists' Society to 

 Arthur's Seat. The attendance at this excursion was the 

 largest of the season. Dr Peach was to have described the 

 geology of the hill, but owing to indisposition he was unable 

 to be present, and Mr Stenhouse kindly acted in his absence. 

 The party met at Holyrood, and were conducted to the 

 Hunter's Bog and round Salisbury Crags to Dunsapie, and 

 thence over the hill to St Anthony's Chapel.. The leader 

 described the different geological formations on the route, and 

 carefully explained the ideas of Dr Peach from a map illus- 

 trating his recent publication, ' Description of Arthur's Seat 

 Volcano,' by B. K Peach, LL.D., F.RS. Members who were 

 not present can obtain this, the latest description of Arthur's 

 Seat, from W. & A. K. Johnston Ltd., 2 St Andrew Square, 

 for the small sum of sixpence. 



