134 Messrs. Knox on the Insidation of Fluorine. 



EXPLANATION OF PLATE. 



FIRST SET OF VESSELS, ONE-HALF OF THE ACTUAL SIZE. 



Fig. 1. — The vessel. 



Fig. 2. — Receiver and its stopper. 



Fig. 3. — The whole, together with lamp, as when in use. 



SECOND SET OF VESSELS, ONE-THIRD OF ACTUAL SIZE. 



Fig. 4. — The vessel. 



A. — The shoulder on which the table rests. 

 Fig. 5.— The table. 



B. — The flat edge. 



c. — The small depressions. 



D. — Aperture in centre, through which the top of vessel is inserted. 

 Fig. 6. — The receiver. 



E. — The clear piece inserted in the side. 



H. — The aperture in which the stopper fits. 

 Fig. 7. — The stopper. 



Pig, 8. — The whole apparatus, when put together on a tripod, with the receiver 

 fastened down by a clamp. 



