1902-3.] 
Meetings of the Society. 
593 
fauna. The paper in which these results are recorded is 
unquestionably a most important contribution to the geology of 
Scotland. 
In his later paper on the Trap Dykes of the Orkneys, Dr Flett 
distinguishes himself in quite another field of geological investiga- 
tion. The existence of these dykes had been known for many 
years. Almost every geologist, indeed, who has visited Orkney 
makes mention of them. Usually they have been described as 
basalts, and referred to as similar in character and origin, and 
perhaps in age, to the Tertiary dykes so abundantly met with in 
West-Central Scotland. But Dr Flett’s exhaustive researches in 
the field and the laboratory have demonstrated that the Orkney 
dykes really belong to certain somewhat rare types of rock, 
hitherto unknown in Britain. This paper, like its predecessor, 
bears testimony to the skill of its author as a field-observer — 
nothing bearing on the nature, origin, or probable age of the dykes 
seems to have escaped him. More than this, it has shown him to 
be a thoroughly equipped petrologist, who, unlike many others, is 
not only an expert microscopist but a facile chemist. 
It is not too much to say that these papers have placed their 
author in the front rank of geological investigators. The Council, 
in awarding the Neill Prize to Dr Flett, would signify not only 
their high appreciation of the work he has accomplished, but their 
confident expectation that he will continue to increase the reputa- 
tion he has already secured. 
The following Communications were read : — 
1. Magnetic Shielding in Hollow Iron Cylinders and Superposed 
Magnetic Inductions in Iron. By James Bussell, Esq. pp. 312-313, 
and Trans., vol. 40, pp. 631-681. 
2. Additional Note on the Use of Quaternions in the Theory of Screws. 
By William Peddie, Esq., D.Sc. pp. 314-320. 
3. Change of Besistance of Nickel due to Magnetisation at different 
Temperatures. — II. By C. G. Knott, Esq., D.Sc. 
4. Further Note on the Causes which determine the Formation of 
Amorphous Sulphur. By Professor Alexander Smith, B.Sc., Ph.D. 
