34 The Microscope. 



or a bellows shaped arrangement more or less like that shown 

 in situ on the arm. Or, the lenses being removed, a split wire 

 may be inserted into the hollow end of the arm, bearing a pair 

 of hinged semi-circular jaws, shwn in the figure, for carrying 

 an engraver's glass or any variety of large lenses not requiring 

 delicate adjustment. For magnifiers of higher power, requiring 

 more precise adjustment, a ring is substituted for the jaws. 



There is a fine adjustment at the top of the rectangular 

 frame, where a screw with milled head, pressing the pillar 

 against the spring, promptly but steadily depresses the lenses 

 to the extent of about four times its own motion. 



This apparatus was made for me by the Bausch & Lomb 

 Optical Company, of Rochester. When supplied with suitable 

 lenses, and kept standing always ready upon the table, it be- 

 comes constantly useful, even to persons well supplied with 

 elaborate apparatus. If transmitted light be required, the ob- 

 jects are placed upon the stage of any dissecting microscope 

 that may be within reach. By turning the jaws or ring into a 

 vertical position, it is well adapted to the examination of living 

 organisms in a glass jar or aquarium; for which purpose pow- 

 ers of 50 to 100 diameters may become available by using the 

 Brucke magnifier, or the Bausch & Lomb compound dissecting 

 magnifier, which for this use should be screwed, not slipped, 

 into the ring. 



A NEW VORTICELLA. 



DR. ALFRED C STOKES. 



PROBABLY the most interesting Vorticellae, all of which are 

 attractive, are those species whose surface is ornamented by 

 bead-like elevations, as in V. monilata, Tatem, by a cellular 

 covering, as in V. vestita, Stokes, by ovoid, nucleated elevations 

 as in V. Lockwoodii, Stokes, or by some other curious and un- 

 expected decoration. Nature seems to have had a special fond- 

 ness for these active little creatures and to have taken special 

 care in embellishing them and rendering their elegant forms 

 more beautiful by what may not inaptly be called infusorial 

 sculpturing. 



But the most remarkable of these cuticular additions thus 



