PROCEEDINGS OF THE SOCIETY. 
369 
form instead of something three inches thick. He saw some time ago a 
French folding Microscope which had the germs of this idea about it, 
and he thought it would be possible to contrive some means of joint- 
ing or swinging the stage so as to obviate the necessity for such a 
thickness. 
Dr. W. H. Dallinger thought that for the purposes of the surgeon in 
India a Microscope of this kind was most valuable ; it had a condenser, 
a mirror, rack-and-pinion movement, and all that was really essential in 
an instrument of this class. 
Mr. J. Rheinberg’s paper , 4 On an Addition to the Methods of Micro- 
scopical Research by a new way of optically producing colour contrast 
between an object and its background, or between definite parts of the 
object itself,’ was read by Mr. E. M. Nelson. 
The President said he had great pleasure in announcing that they 
were honoured that evening by the presence of Dr. S. Czapski, the co- 
adjutor and successor of Prof. Abbe at the well-known establishment of 
Carl Zeiss at Jena. He desired, in the name of the Royal Microscopical 
Society, to express to Dr. Czapski the great pleasure it gave them to 
welcome him on that occasion. 
Dr. Czapski said it was a little difficult for him to express what he 
felt, on account of his imperfect command of the English language, and 
he would on that account ask the indulgence of the Fellows present 
whilst he endeavoured very sincerely to reciprocate the kindly feeling 
shown towards himself by the reception which had been accorded to 
him. When he thought that nearly all the progress made in microscopy 
had been the result of the labours of English workers, it was with no 
ordinary feelings that he now found himself to be at that moment asso- 
ciated with the men whose papers he had been so often reading, and 
whose work he had so long followed with such interest. He desired to 
express to the Society the great pleasure it gave him to be present at 
their meeting, and his sincere thanks for the very kind manner in which 
he had been welcomed. 
With regard to the paper which had just been read, it had been 
mentioned that he was acquainted with the method which it described, 
and he might say that Mr. Rheinberg applied some time since to the 
firm of Zeiss, and that they were extremely interested in the results 
which he said he was able to attain by his method. There were, 
however, some difficulties of an optical character to be overcome, and 
they endeavoured to solve the problem for themselves, with the result 
that they were at last able to devise a method by which the same kind 
of results could be obtained, with the exception that whereas Mr. Rhein- 
berg’s method was principally suited to high-power work, their own 
plan was more suitable for work with low powers. Both these methods 
were illustrated in the room, and he wished, on his own part, fully to 
recognise the ability with which Mr. Rheinberg had worked out so suc- 
cessfully his ideas on the matter. This was perhaps the more remarkable 
because about a year and a half ago Mr. Rheinberg had so little know- 
ledge of microscopy that he had applied to them for advice as to the 
best way in which to acquire it. They gave him the best advice they 
