46 On Mounting. 



Place the cover glasses to be cleaned in a glass 

 vessel containing strong sulphuric acid, and agitate 

 gently until the acid has penetrated between the 

 glasses and driven out the air-bubbles, let them remain 

 in this for an hour or two and then wash well in water 

 until no acid is left. Eemove them to a capsule con- 

 taining methylated spirit. Take out each one separ- 

 ately with a pair of broad pointed forceps, and wipe dry 

 with a silk or soft linen rag. 



With very thin cover glasses, such as -003, each 

 glass may be dipped in absolute alcohol when taken out 

 of the methylated spirit and then carefully dried with 

 an old silk handkerchief. 



MOUNTING FLUIDS. 



For fresh tissues : 



Glycerine . 

 For hardened tissues : 



Canada balsam solution. 

 Dammar varnish. 



MOUNTING FKESH TISSUES, 



Place the tissue to be mounted in a capsule of water 

 of sufficient depth to cover more than half of an ordi- 

 nary glass slide, when placed in it with one end on the 

 bottom and the other resting on the opposite side. 

 With a needle, bring the tissue over the middle of the 

 slide and hold it there, at the same time raise the upper 

 end of the slide very gently, so that the tissue will 

 adhere to it and be raised out of the water. See that it 



