Research Lahoratory of the Royal Collcye of Fhysicians. 527 



plate, so that after a few sections have been made, tlie plate 

 with the piece of tissue may be removed and put aside until 

 again required. There has also been added a tin box about 

 four inches deep, with a bottom an inch from the lower 

 margin of the sides ; this box fits over the second plate. It 

 is provided with a lid, has the bottom sloping to one end, 

 and has an outlet pipe, to which a piece of india-rubber 

 tubing may be attached. It is filled with ice and salt 

 freezing mixture, and its use greatly hastens the freezing 

 of the mass of tissue to be cut. 



On the second flat, three of the five rooms are occupied 

 by the Laboratory Assistant. Of the others, a large room is 

 set apart for Committee Meetings, and is used as a Library 

 and Museum. It is also fitted with an Oertling's short 



SPECTROSCOPE, 

 BALANCE ^ M U S E U M 



i^^**^ 



f^i^acsSX 



SUPERINTENDENTS 



beam balance, supported on a solid iron bracket let into 

 the wall. 



A certificated barometer graduated in inches and 

 millimetres, and a thermometer with Centigrade and Fah- 

 renheit scales, are placed here for temperature and pressure 

 corrections. 



There is also a large spectroscope made by the Cambridge 

 Scientific Instrument Company, with Steinheil's prisms. It 

 is protected when not in use by a glass case, counterbalanced 

 in the same way as are the bell jars at the microscope 

 windows. 



A museum case, book shelves, and writing tables complete 

 the fittings in this room. 



The fifth room on this flat is the Superintendent's private 



