Mr. Davy’s Lecture , &c. 
104 
the nature of nitrogene is fully solved, all systematic arrange- 
ments made upon this idea must be regarded as premature. 
EXPLANATION OF THE FIGURES. 
Fig. 1. The retort of plate glass for heating potassium in 
gases. 
Fig. 2. The tray of platina for receiving the potassium. 
Fig. 3. The platina tube for receiving the tray in experi- 
ments of distillation. 
Fig. 4. The apparatus for taking the Voltaic spark in sul- 
phur and phosphorus. 
