806 
PBOCEEDINGS OF THE SOCIETY. 
Meeting of 18th October, 1893, at 20 Hanover Square, W., 
The President (A. D. Michael, Esq., F.L.S.) in the Chair. 
The Minutes of the Meeting of 21st June last were read and con- 
firmed, and were signed by the President. 
The List of Donations (exclusive of exchanges and reprints) 
received since the last meeting was read, and the thanks of the Society 
were voted to the donors. 
Transactions of the Seventh International Congress of Hygiene. 
Vols. ii. and iii. (8 vo, London, 1892) 
A. B. Lee, The Microtomist’s Yade Mecum. 3rd edition. (8vo, 
London, 1893) 
J. W. Lovibond, Measurement of Light and Colour Sensations. 
(8vo, London, 1893) 
W. B. Turner, Freshwater Algm of Eastern India. (4to, Stock- 
holm, 1893) 
11th Annual Report of the U.S. Geological Survey. (1893) 
Two Slides (Hair of Notoryctes typhlops ; Ixodes flavomaculatus ?) 
Two Microscopes by Oberhaeuser 
From 
Prof. F. J. Bell. 
The Author. 
The Author. 
The Author. 
The Survey. 
Mr. B. T. Lewis. 
Dr. J. B. Nias. J 
Prof. F. J. Bell called attention to the book presented to the Society 
by Mr. Lovibond { On the Measurement of Light and Colour Sensations,’ 
which embodied the results of his researches on the subject. 
Mr. E. M. Nelson thought this was a most valuable and interesting 
work. The author had stated the case in the most beautiful way, and 
the illustrations were extremely good. 
Prof. Bell said they had also another donation for which their 
special thanks were due. It would be remembered that at their last 
meeting a paper was read by Dr. Nias upon the Continental form of 
stand, and that a considerable interest was excited by the discussion 
which followed. Dr. Nias appeared to have been pleased with his 
reception, and had presented the Society with two examples of Ober- 
haeuser’s Microscopes, which would be valuable additions to their 
collection. 
On the motion of the President the special thanks of the Society 
were voted to Dr. Nias for his donation. 
Mr. J. G. Grenfell described by means of drawings on the board 
some specimens of diatoms which he had recently found at Plymouth, 
belonging to the genera Melosira and Surirella , which appeared to be 
of exceptional interest from the presence of pseudopodia. In specimens 
identified as Melosira costata these formed a iringe round the extremities 
of each frustule. 
Mr. A. W. Bennett said he should like to say a word on one point 
which occurred to him in connection with these appendages. He did 
not like to insist too much upon his own view of the matter, but he 
