24 Transactions of the Society. 



exhibited by Dr. Millar this evening, and forms the subject of a 

 separate paper. 



(5) Although not a "form of camera lucida," yet it will not be out 

 of place while dealing with this subject to call attention to a modifica- 

 tion of a method of drawing objects under the Microscope originally 

 described in 'Hardwicke's Science-Gossip' for 1867 (p. 236.) The 

 method there suggested was to throw the image formed by the 

 object-glass on to a sheet of paper fixed over a piece of common 

 window-glass at one end of a " camera obscura," the Microscope 

 being placed at the other end, and the eye-piece removed. Mr. H. 

 E. Forrest, of Birmingham, now suggests that a rectangular prism 

 should be placed over the eye-piece of a horizontal Microscope, thus 

 throwing the image of the strongly illuminated object on to the 

 paper on the table, the room being darkened. This method, while 

 obviously requiring powerful illumination for high powers, is said 

 to " enable even diatoms to be drawn with a \ objective." 



I have purposely abstained from any criticism on the various 

 methods above described, preferring to confine myself to a simple 

 record of the fact of their invention. 



