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DR. HENEAGE GIBBES. 
On the Use of the Wenham Binocular with High 
Powers. By Heneage Gibbes, M.B. 
A GREAT many plans have been tried for the purpose of 
obtaining stereoscopic effect with high powers, and these 
have all required a special stand or special apparatus entirely 
removed out of the reach of the ordinary working micro- 
scopist, and this led I think to the prevalent idea that the 
binocular microscope is entirely unsuited for histological or 
pathological research. 
Mr. Stewart, of St. Thomas’s Hospital, showed me a -u of 
Zeiss’s, which, by removing the front part and screwing it 
on to an adapter, gave perfect stereoscopic effect, and this 
induced me to try the oil-immersion lenses in the same way. 
I unscrewed the front of my -jV oil by Zeiss, and screwed 
it on to an adapter made in such a manner that the lens was 
brought as close as this form of mount would allow to the 
prism, and by cutting off the lower part of the slide below 
the rackwork of the coarse adjustment I was enabled to 
bring the objective low enough to reach the object. 
With this arrangement I found tjiat I could not get per- 
fect stereoscopic effect, but I got it near enough to show me 
that if I could bring the glass a little nearer the prism the 
effect would be obtained, the black bands on either side of 
the field being very small. With this view Messrs. Powell 
.and Lealand made me a oil immersion in w'hich the front 
is made to screw off just behind the back combination, and 
a screw is cut on the outside, so that the front can be 
screwed into an adapter, and this again into the body of the 
binocular microscope, thus bringing the objective almost in 
contact with the prism. 
AVith this glass the stereoscopic effect is perfect, the whole 
.field is illuminated, and the result obtained is really wonder- 
ful. Taking a preparation of the tadpole’s tail hardened in 
gold solution, the different elements are seen in their true 
relations to each other; there is no difficulty in deciding 
whether a line nerve-termination passes over or under or 
INTO a connective-tissue corpuscle. Cells are seen not as 
flat plates, but as spheroidal bodies, with their intranuclear 
and intracellular network pervading their whole substance. 
The only difficulty I have found is to persuade people that 
the power is really so high, objects stand out in such bold 
relief, they cannot believe it possible. I have had a 
made by Messrs. Powell and Lealand, and this glass, although 
