CONTENTS. vil 
Page 
PART XVI. 
Arr. XVIII.—On the Structure and Characters of the Ganoidei, 
and on the Natural Classification of Fish. By J. MuLver, 
Professor of Anatomy in the University of Berlin ........ 499 
Art. XIX.—Further Remarks on the Structure of the Ganoidei. 
SON RETIRE ta) ag arnt ahs, ons ls din #ie'B eye kn, CS ain Agje sie ae 543 
Art. XX.—On the Elastic Forces of Aqueous Vapour. By M. 
WeREGNAULT p55 10% payee Jee #0 aio AEN ia iat 559 
Arr. XXI.—Hygrometrical Researches. By M.V. ReGnautt. 606 
Arr. XXII.—Opinions relating to the Composition of Organic 
Substances. By J. BERZELIUS .....1.-..2-0e-e eee oe 661 
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