ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



1013 



rubber which acts as a spring. The other two screws are provided with 

 milled heads, and work in holes tapped in the outer tube, their points alone 

 being free from thread, and made to fit exactly into the slot of the double 



Fig. 237, 



"f 



6 ^ 



£]_ 



Elevation of stage and foot when folded, a, transverse limb of foot ; b, antero-posterior 

 ditto ; c, pillar ; d, stage. 



collar, which they press against the resistance of the rubber spring. The 

 second objective is carried within the tube of the Microscope, screwing for 

 packing on to the upper side of an adapter. This also serves to carry the 

 analyser when the polariscope is in use." 



Nelson's Portable Microscope. — Mr. E. M. Nelson exhibited at the 

 November meeting of the Society a new portable Microscope (figs. 238 and 

 239), made by Messrs. Powell & Lealand from his drawings. 



Fig. 238. 



The instrument is adapted for three different modes of use, viz. : — (1) As 

 a small table Microscope for home use (a very useful adjunct to a large 

 instrument) ; (2) as a portable Microscope for the exhibition of objects at 



