524 



SUWMAKY OF CUKRENT RESEAKCHE« 



means of a screw. The concave mirror which serves for illuminating 

 purposes is universally adjustable. When not in use the upper portion 

 of the tube is unscrewed and screwed into the main tube in the reversed 

 position. Moreover, the main tube is pushed down as far as possible 

 through the large opening in the stage, so that the whole stand takes up 



Fig. 72. 



little room when being carried. Two specimen clips are supplied with 

 the instrument. The whole stand, with all accessories, is packed in a 

 brown canvas case, and weighs 800 grm. 



Swift's new " Premier " Microscope. — This instrument (fig. 73) 

 though designed primarily for photomicrography, is well adapted for 



