1885.] 



MICROSCOPICAL JOUKNAL. 



45 



appearance is now definitely settled 

 by the pliotograpic record. It re- 

 mains for some of our experts with 

 fine objectives to repeat the observa- 

 tions of Dr. Van Heurck, and we 

 hope to hear from them before lonj^^. 



Bullocli's Coiiibinatiou Microtome. 



The method of cutting serial sec- 

 tions has, almost, it seems, within a 

 few months, brought about a wonder- 

 ful change in the methods of micro- 

 scopical research in biology and em- 

 bryology and to some extent also in 

 pathology. The great importance of 

 this method of investigation has led 

 to the designing of various forms of 

 microtomes in Germany and England. 

 Mr. Bulloch now offers one which he 

 regards as an improvement over all 

 the others. He has already sold sev- 

 eral, of them, which seem to have 

 given perfect satisfaction. 



The illustration, fig. 12, is one- 

 fourth the natural size, but the height 

 seems to he somewhat exaggerated in 

 proportion to the length, owing to the 



perspective of the view. The price 

 of the complete instrument is $65.00. 

 Mr. Bulloch has prepared the follow- 

 ing description for this Journal : — 



This microtome, which has lately 

 been constructed by W. H. Bulloch, 

 is claimed to be a combination of the 

 best points of the German and French 

 instruments with some of his own 

 improvements. The illustration will 

 give a general idea of the construction. 

 The main slide for the knife-carrier is 

 10^ inches long ; the height to the cut- 

 ting edge of the knife 5^ inches ; 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 cush- 

 ions to prevent the carrier passing over 

 the end. The upper surface of the 

 knife-carrier is made adjustable ; so 

 the knife can be made to cut at what- 

 ever inclination is found best. The 

 knife can also be placed at any angle 

 for cutting, or adjusted to cut at right 



Fig. 12. — Bulloch's Combination Microtome. 



