840 



SUMMARY OF CUURENT RESEARCIIIiS I!Er,ATING TO 



which jiassos through G, ainl the hitter in its turn is supporlctl on an 

 inclined phino formed by the bars L. Every raising of the bh)ck G, 

 0*005 mm., is indicated by an audible click produced by the jilate H. 

 The last arraugomcut is ungeared by means of the handle h when the 



coarse-adjustment of the preparation is necessary. The pressure of the 

 block G on the micrometer-screw is obviated by the counterpoise N 

 suspended by a cord running over two rollers. 



Accessory for rapid Cuttings with the Thoma Microtome.* — Herr 

 J. Enliis has devised an arrangement for the Thoma microtome whereby 

 the knife-carrier is set in motion by i^edals, thus leaving both hands free 

 to manipulate the sections, &c. This is claimed to be an improvement, as 

 heretofore the right hand was employed in moving the knife along, &c., 

 while the left was used merely for preventing the section from rolling up. 



A plate about 1^ cm. in diameter, and perforated by a hole in its 

 centre, is fixed to the knife-carrier by means of its binding-screw. 

 Either end is terminated by a small hook. These hooks are connected 

 with cords which run over pulleys (see fig. 156) to pedals. On the end 

 of the microtome farthest from the pulleys, the cord runs over two 

 pulleys, on the nearer side over one. Both cords then pass over another 

 pair of pulleys which are fixed to the edge of the table, and then pass 

 down to the pedals. 



It is advised to fix the microtome to the table by means of strips of 



* Internat Monatsclir. f. Anat. u. Hist , ii. ^885) pp. 313-G (1 fig.). 



