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PKOCEEDINGS OP THE SOCIETY. 
Meeting of 11th December, 1889, at King’s College, Strand, W.C., 
THE Eev. Dr. Dallinger, F.E.S., Vice-President, in the Chair. 
The Minutes of the meeting of 13th November last were read and 
confirmed, and were signed by the Chairman. 
The List of Donations (exclusive of exchanges and reprints) 
received since the last meeting was submitted, and the thanks of the 
Society given to the donors. 
From 
Slides (24) of Botanical Sections Mr. II. P. Aylward. 
Slides (2) of Diatoms from Isle of Skye Mr. W. Godden. 
Mr. E. M. Nelson read a paper descriptive of a new “ semi- 
apochromatic ” objective which he exhibited {supra, p. 92). 
The Chairman said they were much obliged to Mr. Nelson for his 
paper, which was a thoroughly practical one. The introduction of such 
lenses as the one described was a matter of some moment to our English 
makers, and made it somewhat necessary for them to look to their 
laurels, because it was not only in a matter of cheapness that they were 
called upon to compete, but in cheapness combined with perfection. 
In some of those objectives which he had lately had an opportunity of 
examining the cheapness had been combined with what certainly was a 
very close approximation to perfection. In the case of one objective by 
Herr Schott, and also of two by Leitz, they were found to be so good 
that the price was perfectly marvellous. 
Mr. C. Eousselet exhibited a small tank for Eotifers, &c., with a 
lens attached, which could be readily moved about in such a way as to 
render an examination of the contents very easy, so that any desired 
specimens could be easily picked out. The collection which the tank 
contained also showed that Eotifers could be readily obtained in winter. 
The lens used was Zeiss’s No. 6 “ Steinheil ” (supra, p. 90). 
The Chairman called the attention of the Fellows to this exhibit, 
which he thought would prove very useful to those who were collectors 
of Eotifera and other so-called “ microscopic ” aquatic animals. 
Mr, Crisp called the attention of the meeting to a number of stereo- 
scopic photomicrographs of human embryos which were shown at their 
recent soiree by Prof. Fol. They were of great interest, and would 
rejiay careful examination. In addition to their value from an embryo- 
logical jioint of view, they also afforded a conclusive answer to the 
question brought forward at the October meeting as to whether stereo- 
scopic photomicrographs had been produced before that time. Mr. Crisp 
also showed Prof. Fobs large atlas of the human embryo. 
