PHILOSOPHICAL TRANSACTIONS. 



Part II, 1882. 



Contents. 



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

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



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

 Kitchen Paekee, F.E.S. 



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

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



X. The Bakeeian Lecttjee. — Chemical Theory of Gunpowder. By H. Debfs, 

 Ph.D., F.E.S. 



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

 Crystal. By E. T. Glazebeook, 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 Re- 



sistance in Absolute Measure. By Lord Eatleig-h, 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 attached 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 Trubr.er and Co., 57, Ludgate Hill. 



