768 



of a plate of 



COMPOUND MIOKOSCOPE. 

 with four apertures of different diameters, made to 



Fig. 948. 



Fig. 949, 



revolve on a central pin or axis fixed to the bottom of the stage. 



Figs. 948 and 949 represent Gruby's portable compound microscope one-half its real 

 size. Fig. 948. The instrament in its case. Fig. 949. The instrument mounted. A Ml 

 description is given by Dr. Bennett in the EdmbwghMontMy MedimlJvwrnal for December 

 1846. 



