Phosphorescence of phosphorus

Had Europe possessed an Arctic climate with a maximum temperature below 7° C., it is possible that the discovery of the phosphorescence of phosphorus might have been long delayed. Upon ignition with a lighted taper the phosphorescent temperature interval would have been so rapidly passed that the phenomenon would not ordinarily be observed. 

It should be noted that the limits so defined, which bound the region of apparent equilibrium, are by no means fixed. In the phosphorescence of phosphorus, e. g., they depend on the amount of moisture present. The combination of oxygen and hydrogen, again, is ultimately dependent on the substance with which the gases are in contact. Thus, Mitscherlich gives the temperature of explosion in glass vessels as 674° instead of 845 . 

Reaction-point for the phosphorescence of phosphorus. Joubert s studies.—For the majority of cases the complexity is less at the moment when the syst m reaches the reaction-point there is produced a reaction whose nature does not depend upon the initial composition of the S3rstem. 

Silicon trichloride. Investigations of Troost and Haute-feuille, 890.—293. Systems with unlimited reaction and the principle of maximum work, 891.—294. Systems with unlimited reaction are not essentially distinct from systems with limited reaction, 891. —295. One may always cool a chemical system sufficiently for it to exist in the state of false equilibrium, 898.-296. False equilibria at very low temperatures. Pictet s researches, 898.—297. The reaction point, 894.—298. Reaction point in the phosphorescence of phosphorus, 896.—299. Analogy of the states of false equilibria with the mechanical equilibria due to friction, 898.—300. The existence of false equilibria in chemical i stems is not exceptional but regular,... 

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