68 PROCEEDINGS OF SOCIETIES. 
Dr. Mann thought that the rising and sinking could not be 
caused by the temperature, as that increased as the line was 
approached at so even a rate. 
The PrestpENtT, in closing the discussion, proposed a vote of 
thanks to Major Owen for his paper (which was unanimously 
awarded), and expressed his satisfaction that they would have 
the benefit of Dr. Mann’s further investigations into the subject 
on his return to Natal, with the additional advantage he would 
now possess by having the aid of the spectroscope in so doing. 
Major OWEN, in responding, said that what he had brought for- 
ward must be taken as facts only, as he drew no conclusions from 
them. Advyerting to the effect of polarized light upon the speci- 
mens, the Major added that he had one prepared in Canada bal- 
sam which retained its colour, which they very rarely did. The 
smallest chambers were a bright red, and the larger chambers of 
a reddish-brown. 
The PrestpEnt reported that the application for the Charter 
was proceeding satisfactorily, and with every prospect of success. 
The meeting then adjourned to Wednesday, 10th October next. 
October 10th, 1866. 
JAMES GLAISHER, Esq., F.R.S., President, in the chair. 
The minutes of the preceding meeting were read and confirmed. 
Various presents were announced, and the thanks of the Society 
returned to their respective donors. 
Certificates of thirteen candidates for admission into the Society 
were read and ordered to be suspended in the usual manner. 
R. Braithwaite, M.D., F.L.S., &¢., 59, Vauxhall Walk, was 
balloted for and duly elected a Fellow of the Society. 
The President announced the death of Richard Beck, Esq. He 
also produced and read the Charter of Incorporation, and an- 
nounced that the next meeting would bea special general one, to 
consider and pass the by-laws of the Society as now constituted. 
The cordial thanks of the meeting were returned to the Presi- 
dent, James Glaisher, Esq., for his exertions on behalf of the 
Society in obtaining the Charter. 
T. W. Burr, Esq., was presented with a silver inkstand as an 
acknowledgment of his valuable and gratuitous services in obtaining 
the Charter of Incorporation. 
H. J. Slack, Esq., F.G.S., Hon. Sec. R.M.S., read a paper “ On 
a Diaphragm Eye-piece for the Microscope.” (‘'Trans.,’ p. 1.) 
At the close of a short discussion on this paper the President 
remarked that he had used this eye-piece, and had been able to 
take in the whole field; and that on limiting the field in the way 
described he found that he saw much better than when the eye 
was drowned with the light of the whole field. This apparatus also 
had the advantage of enabling them to isolate a square or a 
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