636 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



By removing the mirror and screwed ping into which it fits, the 

 " single " Microscope can be attached to the heliostat that accompanies 

 it as an accessory ; it then forms a solar projection Microscope (fig. 97). 

 At the bottom of this illustration will be seen another accessory desig- 

 nated " A New Apparatus for confining Frogs, Mice, Bats, or any other 

 Creatures of like Size particularly adapted to the Universal Microscope."* 

 This apparatus consists of a rectangular brass frame 4f x 2 T 9 -g- in., 

 upon which a frog or fish could be stretched for examination under the 

 Microscope. 



To the left of the same figure will be seen a " Contrivance to 

 confine a small fish," whereby the circulation of the blood in its tail 

 may be viewed " with Ease and Pleasure."! 



There are other pieces of apparatus usually supplied with Micro- 

 scopes at that time. 



(3) Illuminating and other Apparatus. 



Reichert's Reflecting Condensers for Dark-Ground Illumination, 

 and some Auxiliaries.! — These condensers are intended for the demon- 



Fig. 98. 



st ration of ultra-microscopic particles, and, besides bringing into view 

 ultra-microscopic particles in colloid liquids and fresh blood, serve to 



* Micrographia Illustrata, by George Adams. The Second Edition, 1747, p. 42. 



t Tom. cit., p. 3. 



X Pamphlet, with above title. C. Reichert, Vienna. 



