226 «6S. L. Penfield—Chemical Composition of Triphylite. 
exalted to an ultra-gaseous state, in which the very decided but 
hitherto masked properties now under investigation come int 
we can never enter, and in which we must be content to 
observe and experiment from the outside. 
Art. XXVII—On the Chemical Composition of Triphylite; by 
SamuEL L. PENFIELD, Ph.B., Assistant in the Sheffield Lab- 
oratory.— Contributions from the Sheffield Laboratory of Yale 
College, No. LIII. 
*This Journal, III, xiii, 426, June, 1877. 4 Ibid., II, xxxiv, 402, Nov. 1862. 
