114 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Crouch's Histological Microscope. — Fig. 7 shows an inexpen- 

 sive student's stand, as supplied by Mr. Crouch. The foot is of one 

 casting. The stage has a glass bed. A substage slides beneath into 



Fig. 7 



a cylindrical fitting, with centering arrangement, as in Hartnack s 

 stand ; and sliding cylindrical diaphragms can be pushed up so as to 

 be flush with the upper surface of the stage. The optical body slides 



