Production of Sections 



269 



basin upon a piece of cold metal, when the lower stratum 

 of wax will rapidly harden sufficiently to support the 

 object, even should it be a pyramid standing on its apex. 





Fig. 73.— Paraffin Cooled Rapidly. ( x 250 Diameters. ) 

 Very small crystals. 



Immediately on placing the basin upon the cold metal, keep 

 the object moving with a heated needle, so that it does not 





MM -A 



j0KS^/^^ 4 



YiG. 7i. PAR.iFFiN Wax Cooled Slowly. ( x 250 Diameters. ) 



Observe large crystals. 



stick in the wrong direction to the cooling paraffin at the 

 bottom. In a few seconds it will be found that the object 

 will stand in any position in which it is placed. When 



