SK<TIO\I,\<; 



737 



celloidin sections and may also he used lor small parafmi sections. Tin- 

 Minot and the now Spencer rotary mierolomes are specially adapted for 

 the production of serial sections in para Hi n. These inst runients of them- 

 selves suggest the manner in which they are to he used, and the teclmir 

 is easily acquired. Like all delicate instruments, they must be kept well 

 cleaned and properly oiled, to do good service. 



Much depends upon the choice and care of the knife. The micro- 



T d 



a 



C 



c' 



d' 



n 



D 



II 



FIG. 594. A METHOD OF PREPARING A PAPER Box FOR PARAFFIN EMBEDDING. 



I. A slip of paper, A, B, D, C, is folded, both ways, on the lines a-a', b-b', c-c', 

 and d-d'. Then being folded into the form shown in II, it is laid flat, the section 

 a, a', b', b, shown in I, being uppermost, and the paper is creased on the lines e-e' 

 and /-/'. It is then opened, folded in the shape of a box, /, e, /', e', forming the bot- 

 tom, and is secured by folding down the ends after creasing the paper on the lines 

 e-f and f-e'. 



tome knives of Jung are of excellent quality and should he kept in good 

 condition by the frequent use of the hone and strop. 



The hone should be of fine Belgian stone. It should he well moist- 

 ened with water, the addition of a little fine soap being a distinct ad- 

 vantage. The edge of the knife, carefully applied to the hone, should 

 first be drawn obliquely from heel to toe and toward the operator, being 

 held at a constant angle and drawn the whole length of the stone. 'The 

 knife is then turned o.ver and the motion is reversed, the knife being 

 held obliquely at an angle equal to the previous one, the edge directed 



