Research Laloratory of the Royal College of Physicians. 529 



one end and opening into the chamber, resting on the stone 

 slab continued outside the chamber, is one of Fletcher's Sand- 

 baths. This room is stocked with most of the apparatus neces- 

 sary for carrying on physiological chemical work, the analysis 

 of air, water, food, and the rest. 



The next room is set apart for blow-pipe work, metal 

 injections (Cathcart's method), embedding in paraffin and 

 celloidin, and section cutting. It is also used as a store 

 room for some of the glass apparatus, and the window is 

 fitted with a table for histological work. 



Fig. 9. 



(a) Binding screw and tube ; (&) razor in position 

 attached ; (o?) die, etc., in position. 



(c) die witli block 



Several modifications have been made in the microtomes 

 used in this room. To the Cambridge rocking microtome 

 Mr Eraser added for me a fixing screw («) to steady the 

 tube in any position on the iron lever, and at Mr G. Brook's 

 suo'crestion I also added a solid end to the brass tube, into 

 which "dies" (c) of various sizes with roughened surfaces 

 can be screwed. This does away with all the inconvenience 

 of having to " melt in " the embedded tissue into the tube. 

 A dozen of the dies may be used, and to each of these a 



