440 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
From the preceding it will be seen that this electrically heated stage 
possesses the following advantages : — 
(1) It can be rapidly adjusted for a certain temperature, which'can 
he kept constant within 0*1° C. 
(2) The temperature can be raised or lowered, and again rendered 
constant, by simply turning the adjustment-screw of the contact-thermo- 
meter. 
Dust-proof Triple Nose-piece. — In Fig. 106 we give a drawing of 
Messrs. W. Watson and Sons’ triple nose-piece, designed for the pur- 
pose of protection from dust. The total diameter of the nose-piece is 
2 inches and an eighth. 
Fig. 106. 
Watson’s Table-Stage. — Fig. 107 represents the table-stage de- 
signed by Mr. G. T. West, and made by Messrs. Watson and Sons,, 
exhibited at the Meeting of the Society on May 17th, and described on. 
p. 355 of this Journal. 
Fig. 107. 
(4): Photomicrography. 
Bitting’ s Photomicrographic Apparatus* — Mr. A. W. Bitting in- 
tends his apparatus to meet all the needs of laboratory work. 
Fig. 108 shows the instrument in an inclined position. The apparatus 
* Proc. Indiana Acad. Sci., 1897, pp. 78-80 (1 fig.). 
