PROCEEDINGS OF 



THE EOYAL SOCIETY. 



VOL. XVII. 



No. 111. 



a; 



/ **v 



SI CONTENTS. 



PAGE 



Note on the Blood-vessel-system of the Eetina of the Hedgehog (being a fourth 

 Contribution to the Anatomy of the Eetina). By J. W. Httlke, F.R.S., 

 Assistant- Surgeon to the^ Middlesex Hospital and the Koyal London 

 Ophthalmic Hospital 357 



On the Measurement of the Luminous Intensity of Light. By William 



Ceooees, F.E.S. &c 358 



Addendum to description of Photometer. By W. Ceooees, F.E.S. . 369 



April 8, 1869. 



I. Preliminary Notice on the Mineral Constituents of the Breitenbach Mete- 

 orite. By Professor N. Stoey Maskelyne, M.A 370 



II. On the Derivatives of Propane (Hydride of Propyl). By C. Schoelemmee 372 



III. Eesearches in Animal Electricity. By Chaeles Bland Badclieie, M.D. . 377 



April 15, 1869. 



I. On the Source of Free Hydrochloric Acid in the Grastric Juice. By Professor 



E. N. Hoeseoed, Cambridge, U. S. A 391 



II. Contributions to the History of Explosive Agents. By F. A. Abel, F.E.S., 



For. Sec.CS 395 



III. Eesults of Magnetical Observations made at Ascension Island, Latitude 

 7° 55' 20" South, Longitude 14° 25' 30" West, from July 1863 to 

 March 1866. By Lieut. Eokeby, E.M 397 



April 22, 1869. 



I. Description of Tarlceria and Lofbusia, two gigantic Types of Arenaceous 



Foraminifera. By Dr. Caepentee, V.P.E.S., andH. B. Beady, F.L.S. . 400 



For continuation of Contents see the 4:th page of Wrapper. 



