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SUMMARY OF CUERENT RESEARCHES RELATING TO 



a " hot stage." This consists 



of a box 4^ X 



2f X 1 in.j through 



which is an aperture for illumination closed at the top and bottom by 

 glass plates. Hot water is brought to the box by the tube on the left 

 and passes away through the waste-pipe on the right. A third 



opening with a tap allows air-bubbles to be eliminated. The arrange- 

 ment for irrigating the object consists of a rod and clamp for 

 supporting a tube, through which the liquid can be directed upon the 

 object. The stage being inclined at an angle of about 20° the liquid 



