512 



SUMMARY OF CUKKENT RESEARCHES RELATING TO 



assistants, and others, to detect the presence of parasites, &c, common 

 on man and animals, especially in the tropics. The magnifying power is 



x 150, and the focussing adjustment is made by 

 Fig. 126. rotating the body in its outer jacket-tube ; a pin 



fixed to the body travels in a spiral slot in the 

 jacket-tube, by which means a steadier movement 

 is obtained than with an ordinary push-tube fitting. 

 The instrument is packed in a japanned tin case, 

 complete with glass slips and covers, also directions 

 for use and illustrations of the eggs of the principal 

 internal parasites, such as Anchylostoma, round and 

 whip worms, Amcebse, Bilharzia, Distoma ringeri, &c. 



Fig. 127. 



Fig. 128. 



C. Baker's Attachable Mechanical Stage. — This stage (fig. 128) 

 is specially designed for use with their diagnostic Microscope ; it will 



be found useful in the systematic examina- 

 tion of covers as large as 1^ x 3/4 in. The 

 attachable stage is held in position by a 

 spring runner fitting to the sides of the 

 Microscope stage. A horizontal movement 

 of 1^ in. is obtained by a sliding top plate, 

 which can be worked independently of the 

 screw adjustment. This piece of apparatus, 

 like the Microscope to which it is fitted, is 

 very portable, being 4f x 2^ x 1/2 in. 



(3) Illuminating- and other Apparatus. 



C. Baker's New Achromatic Condenser 



(fig. 129) has a N. A. of 1 • 0, and is a modified 

 j§ form of the well-known Abbe achromatic 

 condenser ; the lenses, however, are smaller, 

 being 7/8 in. diameter instead of 1 T ^, and 

 the aplanatic cone is not less than 0'90. It 

 is supplied with an iris diaphragm, a turn- 

 out stop carrier, and three stops for dark 

 ground illumination. The power of the 

 optical combination is 4/10 in. ; working 

 distance 1/10 in. With the front lens re- 

 moved, this condenser has a power of 8/10 



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