PHILOSOPHICAL TEANS ACTIONS. 



Part II, 1882. 



Contents. 



VII. On the Structure and Development of Lepidosteus. By F. M. Balfour, 

 LL.D., F.E.S., and W. N. Parker. 



VIII. On the Development of the Skull in Lepidosteus osseus. By William 

 Kitchen Parker, F.E.S. 



IX. On the Vibrations of a Vortex King, and the Action upon each other of Two 



Vortices in a Perfect Fluid. By J. J. Thomson, B.A. 



X. The Bakerian Lecture.— Chemical Theory of Gunpowder. By H. Debus 



Ph.D., F.E.S. 



XI. On the Eefraction of Plane Polarized Light at the Surface of a Uniaxal 

 Crystal. By E. T. G-lazebrook, M.A. 



XII. On the Eesults of Eecent Explorations of Erect Trees containing Animal 



Eemains in the Coal-formation of Nova Scotia. By J. W. Dawson 

 LL.D., F.E.S. 



XIII. Experiments to Determine the Value of the British Association Unit of Ee- 



sistance in Absolute Measure. By Lord Eatleigh, F.E.S. 



XIV. On the Comparative Structure of the Brain in Eodents. By W. Bevan 



Lewis, L.E.C.P. (Lond.). 



Index to Part II. 



Price £2. 



Extra volume (vol. 168) containing the Eeports of the Naturalists attaohed to the 

 Transit of Venus Expeditions. Price £3. 



Sold by Harrison and Sons. 



Separate copies of Papers in the Philosophical Transactions, commencing with 1875, 

 may be had of Triibner and Co., 57, Ludgate Hill. 



