Slide-holder for the Microscope.
heavier forming the stage plate ; further description seems scarcely needed. With many objects it is absolutely necessary to have them in a certain position with respect to the light to
see them at all, and with many more a slight change in position renders them far more distinct, and I am led to think that in such cases this slide-holder will be found both con venient and useful from the ease with which a slide placed upon it can be completely rotated ; it might also be found useful in some cases of examining transparent objects by oblique light, and the hole in the lower plate might be made oblong, so as not to interfere with the oblique rays from the
mirror.