CONTENTS. 
PART I. 
I. On the Organization of the Fossil Plants of the Coal-measures . — Part VIX. 
Myelopteris, Psaronius, and Kaloxylon. By W. C. Williamson, F.B.S. , 
Professor of Natural History in Owens College, Manchester . . . page 1 
IT. The Optical Deportment of the Atmosphere in relation to the Phenomena of Putre- 
faction and Infection. By John Tyndall, F.B.S. 27 
III. The Absolute Direction and Intensity of the Fartlis Magnetic Force at Bombay, 
and its Secular and Annual Variations. By Charles Chambers, F.B.S., Super- 
intendent of the Colaba Observatory 75 
IV. On the Structure and Delations of the Alcyonarian Heliopora ceerulea, with some 
Account of the Anatomy of a Species of Sarcophyton, Notes on the Structure of 
Species of the Genera Millepora, Pocillopora, and Stylaster, and Bemarks on the 
Affinities of certain Palaeozoic Corals. By H. N. Moseley, M.A. Oxon., Naturalist 
to the ‘ Challenger ’ Expedition. Communicated by Professor Wyville Thomson, 
F.B.S., Director of the Civilian Staff of the ‘ Challenger ’ 91 
V. On the Development of Lepas fascicularis and the “Archizoea” of Cirripedia. 
By R. yon Willemoes-Suhm, Ph.D., Privat-Docent in Zoology in the University 
of Munich, Naturalist to the i Challenger ’ Expedition. Communicated by Pro- 
fessor C. Wyville Thomson, F.B.S 131 
VI. On Boiling-Friction. By Professor Osborne Reynolds, of Owens College, Man- 
chester. Communicated by Professor B. Stewart, F.B.S 155 
VII. On the Development of the Spinal Nerves in Elasmobranch Fishes. By F. M. 
Balfour, B.A., Fellow of Trinity College, Cambridge. Communicated by Dr. 
Michael Foster, F.B.S., Prcelector in Physiology and Fellow of Trinity College, 
Cambridge 175 
VIII. On the Fossil Mammals of Australia . — Part X. Family Macropodidhs : Man- 
dibular Dentition and Parts of the Skeleton o/Palorchestes ; additional evidences 
of Macropus Titan, Sthenurus, and Procoptodon. By Professor Owen, C.B., 
F.B.S., &c 197 
