ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



507 



they are examined with immersion lenses, though in this case it is 

 necessary that the object should be in actual contact with the cover- 

 glass. 



Fig. 99. 



Fig. Kin. 



Monochromatic Trough.* — This trough (rig. 100), made by the firm 

 of R. and J. Beck, is 4 by 3 by 0'8 in. in size, and is easily adjustable 

 as to height and angle, 'it may be filled with fluid of any tint, though 

 the saturated solution of copper acetate is that most often required. 



Leitz' Triple Revolver with Large Protection Diaphragm.! — This 

 is clearly shown in fig. 101. 



Fig. 101. 



Leitz' Thermometry Stages.}— The Schultze pattern is shown in 

 fig. 102. A metal stage bears at its sides wing-like projections under 

 which the heating flame can be applied. Observation is carried on by a 



* R. and J. Beck's Special Catalogue, 1985. 

 t Catalogue No. 41 (Mikroskope) 1905, p. 110. t Tom. cit., p. 85. 



