76 



The Microscope. 



If an}^ of your readers wish to avail themselves of the facili- 

 ties afforded here for having such a grooved stage device at- 

 tached to their instruments I shall be glad to see to the work 

 for them. 



EDINGER'S DRAWING APPARATUS. 



DR. JOSEPH COLLINS. 



Many able workers with the microscope are hindered from 

 reaping and sowing the full benefit of their work to others by 

 reason of their inability clearly to delineate on paper in the 

 shape of drawings, the result of their researches and labor. Up 

 until a few months ago the only aid that could be called into 

 use was the ordinar}^ camera lucida, and only those of us who 

 have made use of this know how unsatisfactory it is. It seems 

 to have been left to m}^ greatly respected teacher, Dr. Ludwig 

 Edinger, of Frankfurt a Main, to demonstrate to us that a very 

 simple optical device could be utilized for weak magnification 

 and drawing, so that by its aid the merest tyro could make a 

 drawing which would possess that most essential of all prere- 

 quisites, viz., accuracy. 



A glance at the illustration will show that the apparatus con- 

 sists of a stand made of a flat board bearing an upright, made 



