ON STAINING FLUIDS, AND STAINING. 123 



Williams' Freezing Microtome. 



This is made by Messrs. Swift & Son, 81, Totten- 

 ham Court Road, London, W.C., who also make a 

 registered knife carrier, which carries^the blade of a 

 razor : the whole goes under the name of " Swift's 

 Knife." Until the plane iron was thought of, 

 Swift's Knife had the field all to itself, and there 

 will still be those who will prefer it to the plane 

 iron. 



This combination has this great advantage : that 

 in winter, when ice is plentiful, the machine is 

 charged, and freezes strongly for an liour or more. 

 For class work this is excellent : the attendant 

 charges the machine just before the class meets, 

 and the demonstrator cuts a hundred sections of 

 any prepared tissue in a few minutes. If he wishes 

 to cut another specimen, he removes the first, and 



