PHILOSOPHICAL TEANS ACTIONS. 



Part I, 1882; will be published shortly. 



Contents. 



I. On the Electromotive Properties of the Leaf of Dionsea in the Excited and 

 Unexcited States. By J. Bttreon-Sanderson, M.D., E.R.S., Professor of 

 Physiology in University College, London. 



II. Lucifer : a Study in Morphology. By W. K. Brooks, Associate in Biology 

 and Director of the Chesapeake Zoological Laboratory of the Johns Hopkins 

 University, Baltimore, Md., U.S.A. 



III. On the Structure and Development of the Skull in Sturgeons (Acipenser 



rutJienus and A. sturio). By William Kitchen Parker, E.E.S. 



IV. On the Stresses caused in the Interior of the Earth by the Weight of Con- 



tinents and Mountains. By Gr. H. Darwin, F.R..S. 



V. Experimental Determination of the Telocity of White and of Coloured Light. 

 By James Young-, LL.D., E.R.S., and Professor Gr. Eorbes. 



VI. The Bakerian Lecture.- — Action of Eree Molecules on Radiant Heat, and 

 its Conversion thereby into Sound. By John Tyndall, F.R.S. 



Index to Part I. 



Price £1 14s. 



Extra volume (vol. 168) containing the Reports 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 Triibner and Co., 57, Ludgate Hill. 



