II.—On the Gases enclosed in Crystalline Rocks and Minerals. By W. A. Tilden, D.Sc., F.R.S. Proc. Royal Soc, vol. lx (1897), p. 453

1897 Geological Magazine  
doi:10.1017/s0016756800183906 fatcat:4ybwpqwi6bhfzo46wiswnvsfcu