234 PROCEEDINGS OF THE AMERICAN ACADEMY 



Finely pulverized K„MnoOg was dissolved in aqueous hydrofluoric 

 acid, and the solution subjected under pressure to the temperature of 

 100°C two or three hours. The red solution was then evaporated in 

 vacuo. Claret-red prisms belonging to the trimetric system were 

 deposited, in which the ratio of the constituents — Mn, K, and F — 

 was not determined. Consequently this substance also remains for 

 future investigation. 



