PROCEEDINGS OF THE SOCIETY. 383 



skeleton of a parasitic foetus, and demonstrated by means of it 

 the distinctive features of the parasitic connection. He gave at 

 the same time a lucid description of the mode of the development, 

 and the union, of twins. 



Dr. T. Beath Henderson read a paper entitled "A simple 

 method of preserving birds as specimens," and showed several 

 examples of his handiwork as illustrations. The method con- 

 sisted simply in the injection of carbolic acid by considerable 

 force into the body cavity. The acid permeated the tissues of 

 the animal, hardened the tissues, and practically mummified the 

 creature. The method, he said, while useful for small specimens, 

 was not so well adapted for large ones, and was not suitable for 

 museum specimens. 



29th April, 1902. 



Mr. Alex. Somerville, B.Sc, F.L.S., President, in the chair. 



Mr. John Renwick, read reports of the Society's excursions to 

 Craigends and to Murroch and Auchenreoch Glens (see pp. 338 

 and 340). 



Mr. J. J. Robertson, Hon. Secretary, read a paper by Mrs. 

 David Robertson, Millport, Honorary Member, on Litliothamnion 

 glaciale (Kjellm.), a calcareous alga, new to Britain. The 

 authoress stated that the first specimen of this alga was obtained 

 at Port-Bannatyne, Bute, in October, 1895. The late Dr. David 

 Robertson sent it to Mr. E. A. L. Batters, who identified it as 

 above, but, as there was still some doubt, refrained from insert- 

 ing it into the list of the marine algae of the Clyde which he 

 contributed to the Fauna and Flora Handbook for the British 

 Association in 1901. The specimens now exhibited had been 

 kindly authenticated by M. Foslie, of Norway. Kjellmun says — 

 * The species is dispersed over the greater part of the Arctic Sea. 

 Only from the Kara and Siberian Seas it is not known. It 

 attains its most vigorous development, as far as I know, at 

 Spitsbergen and on the west coast of Novaia Zemlya, where it 

 occurs also in the greatest numbers." He also says — "The 

 present plant is a deep-water form. Most often and in the 

 greatest number it is met with at a depth of 10-20 fathoms. 

 The localities where it is known to exist are (1) the Norwegian 



