CONTENTS OF THE FOURTH VOLUME. 
PART XIII. 
Page 
Arr. I.—On the Chemical Reactions produced by Bodies which 
act only by Contact. By Professor M. E. Mirscuervicu. . 1 
Arr. I].—On the Phzenomena presented by a free Liquid Mass 
withdrawn from the Action of Gravity. By Professor PLa- 
TEAU, of the University of Ghent; Member of the Royal 
ee CNA eo teks oo whet ues Dore s = est 16 
Arr. I1I.—Memoir on the Solar Heat, on the Radiating and Ab- 
sorbing Powers of the Atmospheric Air, and on the Tempe- 
rature of Space. By M. Pourtter, Member of the Royal 
Academy of Sciences of Paris; Professor of Natural Phi- 
losophy in the Faculty of Sciences ........ ee See 44 
Arr. IV.—On the Structure of the Vegetable Cell. By Huco 
Mont, Professor of Botany in the University of Tubingen.. 91 
Art. V.—A Description of the Chalk Formation of Northern 
Germany. By Freperick ADOLPH RémrER............ 115 
Art. VI.—On Daltonism [ Dyschrosis, or Colour Blindness]. By 
M. Evie WartMAnN, Professor of Natural Philosophy in 
memscademy of Prinsanne 5! PIT. hs sa. SS 
PART XIV. 
Art. VII.—On the Heat and Elasticity of Gases and Vapours, 
and on the Principles of the Theory of Steam Engines. By 
C. Hotrzmann, Professor of Natural Philosophy and Ma- 
thematics at the Lyceum, Manheim................000- 189 
