418 
PROCEEDINGS OF THE SOCIETY. 
Meeting of 19th April, 1893, at 20 Hanover Square, W., 
The President (Albert D. Michael, Esq., F.L.S.) in the Chair. 
The Minutes of the Meeting of 15th March 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 submitted, and the thanks of the 
Society were given to the donors. 
From 
A. Woodward and B. W. Thomas, The Microscopical Fauna of 
the Cretaceous in Minnesota. (4to, 1893) Mr. F. Crisp. 
5 Slides of Cattle Ticks Mr. B. T. Lewis. 
-Report and Proceedings of the Ealing Natural History and 
Microscopical Society, 1892 The Society. 
7th Annual Report of the Bureau of Ethnology 1 The United States 
Contributions to American Ethnology. Vol. vii j Government. 
Mr. E. M. Nelson said that Dr. H. G. Piffard in the ‘New York 
Medical Journal ’ for July 16th, 1892, proposed to project, for purposes 
of drawing, &c., the real image from the Microscope on to the paper, 
instead of employing a camera or similar instrument. This method, 
which is very successful in the case of low powers, is not new ; it was 
exhibited by himself, both at the Society and at the Quekett some time 
ago ; but the point he wished to bring out was the position of the prism 
in Dr. Piffard’s arrangement. Dr. Piffard had placed it between the 
eye-piece and the objective, whereas it ought to be in the eye-cap. 
In fact a piece of plain looking-glass mounted in the eye-cap at an 
angle of 45° answers the purpose perfectly, working well up to a magni- 
fying power of 300 diameters, and at the same time is quite inexpensive. 
As no notice was taken of his previous communication, Mr. Nelson said 
that he thought it better to bring it again before the Society, as such a 
simple and useful device should be better known. 
Mr. C. Rousselet showed a new compressorium (see ante, p. 386) for 
the exhibition and examination of minute free-swimming animals, the 
great advantage of which was that it enabled an object to be seen in 
every part of the field. 
Mr. It. Macer exhibited and described a new reversible compres- 
sorium which he thought would meet a want often felt by those who, 
after examining a specimen placed on the stage in the ordinary way, 
wanted to see the other side. Finding Beck’s form to be very inconve- 
nient in use he had tried to design one which would answer the purpose 
better, and had brought it to the meeting for inspection. It would be 
