54(5 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



screw is made aiiprcciablc to the car, au advantage which one appre- 

 ciates when cutting sections in series. 



The most certain and suitable method of fastening the prepara- 

 tion is between phitcs, wliieh can be screwed togetlier or apart at 

 pleasure, so as to obviate loosening by temi)erature, &c. 



The simplest form of such ajiparatus is the i)incer, which is added 

 to most slide and screw microtomes. The author has had constructed 



Fig. 12 



a " clamp for wedge and plane parallel sections," in which the posi- 

 tion of the preparation can be changed in three dimensions in a 

 moment, and with which one can make wedge or plane parallel sec- 



FiG. 128. 



tions of definite thickness. This apparatus as at present made (figs. 

 127-129) presents the following features : — 



The pin Z Avhich carries the whole apparatus, is placed further 



