416 D. J. SCOURFIELD ON ASHE's CAMERA LUCIDA. 



Lastly, the tube-fitting of the camera should be made as long 

 as possible. This allows of the camera being moved closer to or 

 farther from the eye-piece, and thus enables the best position to 

 be obtained for use with eye-pieces of different powers and focal 

 lengths. 



Journ. Qicekett Microscopical aub, Ser. 2, Vol. VIL, No. 47, November 1900. 



