4 Proceedings of Royal Society of Edinburgh. [sess. 
attending the Natural Philosophy Class, and through correspond- 
ence in later life. His recommendation was always at the service 
of the best men for public positions connected with science. 
I need not say there are many in this Society who have been 
aided by his instruction and the results of his wide reading in the 
prosecution of their studies and researches. 
W. Williams, Principal of the Veterinary College, Leith Walk, 
was known as an eminent teacher of Veterinary Science to every 
agriculturist and veterinary practitioner in the country. His two 
great works — the one on Veterinary Medicine , and the other on 
Veterinary Surgery — are used as text-hooks, not only in the 
Veterinary Colleges of Great Britain, hut also in those of America. 
George Frederick Armstrong, horn at Doncaster in 1842, after 
being successively Professor of Engineering in JVFGill’s College, 
Montreal, and the Yorkshire College of Science, Leeds, succeeded 
the late Professor Jenkin as Eegius Professor of Engineering in our 
University. He was also appointed Engineering Adviser to the 
Local Government Board for Scotland. During 1879 he under- 
took an extensive series of observations and experiments, with a 
view of determining the diurnal variation in the amount of carbon 
dioxide in the air, the results of which have been accepted as a 
standard of reference on the Continent as well as in this country. 
Sir Thomas Clark, Bart., was head of the widely known 
publishing house of T. & T. Clark, Edinburgh. He filled with 
ability the offices of Assistant, Treasurer, and Master of the 
Edinburgh Merchant Company. In 1885 he was elected Lord 
Provost of Edinburgh. During his provostship his name was 
associated with much good civic work. On the occasion of the 
Queen’s visit to the Edinburgh Exhibition of 1886, Sir Thomas 
Clark received his baronetcy. 
Dr Stevenson Macadam was widely known in Edinburgh as a 
popular and successful lecturer on Chemistry. He taught large- 
classes at the School of Arts, Surgeons’ Hall, and the Veterinary 
Colleges. In 1862 he was made President of the Boyal Scottish 
Society of Arts. He conducted a large consulting business, and 
was much sought after for expert evidence. 
A tragic interest attaches to the death of our Fellow Mr 
Frederick Pullar, who lost his life in one of his beloved lochs,. 
