PROCEEDINGS OF THE SOCIETY. 



109 



in pieces according as to whether the surface rubbed against, 

 in the effort to remove the slough, were smooth or otherwise. 

 Next, the effect of adder venom was described, and the factors 

 upon which the results of a bite depend were discussed. The 

 effect depends chiefly upon the dose of venom injected, the 

 cases which recover being those in which the fatal dose was 

 not thrown into the circulation. 



Dr. Leighton concluded his lecture by throwing upon the 

 screen a series of fifty views of British reptiles, taken from life, 

 and depicting the various habits and haunts of the snakes and 

 lizards in Great Britain. He also exhibited a number of speci- 

 mens of adders, ring snakes, smooth snakes, and lizards, together 

 with some remarkable specimens of large sloughs of boa con- 

 strictors and pythons which had been cast perfectly whole. 



The lecturer, having answered a number of questions put 

 by the audience, was accorded a hearty vote of thanks. 



3 1st March, 1903. 



Mr. Peter Ewing, F.L.S., in the chair. 



Mr. John Renwick gave notice of a motion to amend the 

 rules of the Society as follows : — " That, in constitution of the 

 Society, Chapter 8, Paragraph 6, the word ' seven ' be altered to 

 read ' five,' and the paragraph shall read ' five members of 

 Council shall form a quorum.' " He explained that the 

 necessity for this change arose out of the difficulty of securing 

 a quorum at the meetings of Council. 



On behalf of Mrs. David Robertson, Millport, Mr. Renwick 

 exhibited specimens of Lithothamnium lichenoides, Foslie 

 ( = Melohesia lichenoides, Harvey), new to Scotland. These 

 calcareous algae were collected in rock pools at Port Logan, 

 Galloway, many years ago. Harvey records it from the coast 

 of Cornwall, West of Ireland, the coasts of Galway, Clare, and 

 Cork. Mr. E. A. L. Batters, in A Catalogue of the British 

 Marine Algae, published in 1902, records it from the coasts of 

 Cornwall, Devon, Dorset, Hants., Isle of Man, West Coast of 

 Ireland, and Channel Islands. Mrs. Robertson was congratulated 

 upon her having established a new record for Scotland. 



Dr. T. B. Henderson exhibited a Sea Snake, Euhydris curtus 

 (Boul.). He described its structure, and, comparing it with the 

 land snakes, showed how it was specially adapted for progres- 



