CH. X ] 



PARAFFIN METHOD 



297 



The thinner the sections the harder should be the paraffin or 

 the cooler the sectioning room ; and the thicker the sections and 

 the larger the object to be cut, the softer can be the paraffin and the 

 higher the temperature. If then the sections do not ribbon, make 

 thinner sections or work in a warmer place. If the sections 

 crumple, make thicker sections or work in a cooler room. Of course 

 one can reimbed in a more suitable hardness of paraffin. 



Fig. 235. The Conklin-Pietzsch automatic lever microtome for paraffin 

 sectioning. This is a modified Ryder microtome and is simpler and therefore 

 cheaper than most paraffin instrutnents. It is designed for sections from 

 1-300 to 10-300 mm. (3 1-3 to 33 1-311). By means of a special attachment, 

 sections of 211 may be made. ( Cut loaned by Edward Pennock, Philadelphia. ) 



In the season when steam radiators are used one can get almost 

 any desired temperature by sectioning nearer or farther from the 

 radiator. 



