1081 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



olovator only by means of the pieco of indiarubber, wbicb is sufficiently 

 elastic to allow of tbo few millimetres of play required by tbe slow 

 motion. The object-carrier is a simplo double scrow vico ; it is 

 mounted on a ball-and-socket joint of diameter sufficient to provide 

 an active surfaco of 12 square cm., by means of a tigbtening screw 

 witb lover, by whicb it can bo rigidly fixed ; and wben tbo object to 

 bo cut is inclined, it remains always close to tbo axis of tbo clamping 

 mecbanism. Tbo object-carrier may bo readily replaced by a freezing- 

 stago. 



Scbiefferdecker's New Microtome.* — Dr. P. Schiefferdecker's 

 instrument, of wbicb a gonoral view is given in fig. 240, consists of a 

 beavy stand A (fig. 241), upon wbicb are two blocks B, supporting 

 the plates D and C. Tbe upper part of tbe latter forms part of tbo 

 slide-way. Between C and D is interposed a thick glass plate E, 



Fig. 240. 



while on the oblique part of C is fixed a similar glass plate F. In 

 the angle (45°) between E and F runs tbe body of the knife-carrier G, 

 whicb is separated from the glass plates by ivory knobs, four to each 

 surface. Above the body G is the knife-plate H, connected by three 

 screws with G. This plate and the body are separated by a block 

 for giving an inclination to the knife. The upper surface of the 



* Zeitschr. f. Wise. Mikr., iii. (1886) pp. 151-64 (4 figs.). 



