548 



SUMMARY OP CURRENT RESEARCHES RELATING TO 



A special ftdvautrtgc of this arrangement is that the screw is at 

 the side of the object and not directly under it, so that it is not injured 

 by fluid dropping from the object. 



Fig. 130. 



Bulloch's Combination Microtome.* — This microtome which has 

 lately been constructed by Mr, W. H. Bulloch, is claimed to bo a 

 combination of the best points of the German and French instruments 

 with some of his own improvements. A general idea of the construc- 

 tion is shown in fig. 131. The main slide for the knife-carrier is 

 lO.V in. long ; the height to the cutting edge of the knife 5^ in. ; the 

 knife-carrier is made with eight ivory bearings — four on each side — 

 which provide a smooth and easy running surface, which does not 

 require to be lubricated, At each end of the main slide there is a 

 stop with rubber cushions, to prevent the carrier passing over the 

 end. The upper surface of the knife-carrier is made adjustable, so 

 that the knife can be made to cut at whatever inclination is found 

 best. The knife can also be placed at an angle for cutting, or 

 adjusted to cut at right angles for cutting sections into ribbons. The 

 screw for elevating the slide and holder is graduateil to 1/200 mm., 

 and has a spring-click for registering. The s^iring-click can be 

 turned aside when not required. 



The holder for the material to be cut has universal motion, so 

 that the specimen can be adjusted to be cut at any plane. Each 

 movement is independent of the others, and all are so combined tliat 



* Aiucr. Mou. Jlicr. Joum., vi. (1885) pp. io-(j (1 fig ). 



