31 
Ordinary Meeting, November 28th, 1865. 
R. Angus Smith, Ph.D., F.R.S., &c. s President, in 
the Chair. 
Mr. Francis Hampson, Solicitor, was elected an Ordi- 
nary Member of the Society. 
Mr. Dancer, F.R.A.S., said that in a paper “ On the 
Illumination of Opaque Objects under the high powers of the 
Microscope, 5 ’ read before the Microscopical Section of this 
Society, November 20th, he had described a method of employ- 
ing the oblique body of the binocular microscope with 
Wenham’s prism, for illumination of opaque objects, and he 
had also exhibited an instrument fitted up for this purpose, 
giving the members present a practical demonstration of the 
advantages which this mode of illumination afforded under 
certain circumstances. He wished now to describe another 
method of illuminating opaque objects, and as it is equally 
applicable to monocular and binocular microscopes, it appears 
worthy of some consideration. 
In the method of Mr H. L. Smith, of Kenyon College, 
(which was briefly described in the paper before mentioned), 
and also in the use of the Wenham’s prism there is a con- 
siderable loss of angular aperture, (which is a very important 
consideration) : it occurred to the author that by modifying 
Mr. Smith's contrivance this loss might be diminished in 
some degree ; this has been attempted in the following 
manner. 
Proceedings— Lit. & Phil. Society,— Vol. y.— N o, 5— Session 1865-6, 
