1895-96.] Dr Macintyre on Bontgen X-Rays. 
137 
Some Results obtained with the Rontgen X-Rays. 
By J. Macintyre, M.B., F.R.M.S. 
(Read April 6, 1896.) 
A preliminary demonstration on photography and fluorescence 
was given. A description accompanies the report on the communi- 
cation made on 4tli May 1896. 
When Professor Bontgen’s results were first made known the 
greatest attention was paid to the photography of objects which 
had previously been considered beyond the range of human 
vision. It is clear, however, that the discoverer did more than 
present us with a new photography by a force differing, in many 
respects, from day or artificial light. In his first paragraph he 
describes fluorescence on a prepared screen, and in the second 
he shows how one may see shadows of the bones within a faint 
dark shadow of the hand itself. The obvious advantage of 
being able to throw shadows of the deep-seated structures of 
the body upon screens cannot be over-estimated for medical 
and surgical purposes. The following experiments were under- 
taken with a view of contributing something to the work in this 
direction. 
With regard to the salts employed, screens were prepared 
of potassium-platino-cyanide, barium-platino-cyanide, lithium-rubi- 
dium-platino-cyanide, calcium tungstate in its crystalline form 
(Edison), sulphide of calcium, magnesite, fluorspar, &c. In my 
experience it may be said at once that the potassium and barium- 
platino-cyanide salts were found to be the best, although the 
lithium-rubidium-platino-cyanide gave an excellent picture. The 
fluorescence of the potassium salt is probably in advance of all 
others, but occasionally one seems to get at least a more pleasant 
picture of the deep-seated structures of the body with the barium 
screen, particularly when the latter has a thick coating. 
My earliest attempts failed on account of too little salt being 
used on the screen. In order to get a good sharp image, it is 
