ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 661 



Folariscope, single, for the Toy Microscope. 



[Made of sixteen or eighteen cover-glasses.] 



Engl. Mech., XLV. (1887) pp. 337-8 (2 figs.), from Scientific American. 

 Rogers, W. A. — "Microscopic metal thermometer, by which the indicated temperature 

 is read off upon the eye-piece micrometer of the Microscope." 



Proc. Amer. Soc. Micr., 9th Ann. Meeting, 1886, p. 190. 

 Schroeder's New Lieberkiihns. 



[Made of Wolfram steel.] Joum. Quekett Micr. Cluh, III. (1887) p. 92. 



Selenka, E.— Die elektrische Projections-lampe. (The electric projection lamp.) 



SB. Phys.-med. Soc, Erlangen, 1887, 8 pp. 

 T A T H A M, J. — Illumination of Objects under the Microscope. 



Trans, and Ann. Rep. Manchester Micr. Soc, 1886, pp. 78-9. 

 Thanhoffer, L. v. — Mikroskopische Gaskammer. (Microscopical gas chamber.) 



[Contains only the following abstract — " with which the author investigated 

 under rarefied and compressed air or in different gases the movements of the 

 protoplasm or the circulation of the blood in small transparent animals."] 



Math. u. Naturwiss. Ber. JJngarn., IV. (1886) p. 218. 

 Vanderpoel, F. — Improved settling tube for urinary deposits. 



Amer. Man. Micr. Joum., VIII. (1887) pp. 71-2 (4 figs.) pp. 115-6. 

 Ward, R. H. — Micrometer Wires. 



[Recommends the use of platinum wires in preference to spider threads.] 



Froc. Amer. Soc. Micr., 9th Ann. Meeting, 1886, pp. 89-93. 



(4) Photonucroerapliy. 



Nelson's PhotomicrograpMc Camera. — This camera (fig. 187) was 

 designed by Mr. E. M. Nelson in conjunction with Mr. C. L. Curties, 

 especially for use with Prof. Abbe's new 3-power projection eye-piece. 

 The apparatus consists first of a base-board, which is of suflficient length to 

 take the camera when fully extended, the Microscope, and the lamp. The 

 axis of the camera is fixed at the same height above the board as the optic 



Fig. 187. 



axis of the Nelson Model Microscope, but can be arranged to the height of 

 any stand. 



The camera itself consists of two cardboard tubes, which are light but 

 strong, the one sliding into the other like the tube of a telescope ; the joint 

 between the two tubes is made light-tight by a velvet flap which is 

 fastened down by an indiarubber band. The joint between the Microscope 

 and camera has the usual light-excluding tubes. The camera when closed 

 and used with the 3-power projection eye-piece is arranged to give a magni- 



