LIST OF THE PLATES IN VOL. IV., 
TO ILLUSTRATE THE FOLLOWING MEMOIRS. 
Prates I. and II. Prof. Mont on the Structure of the Vegetable Cell. 
Coloured. 
Ill. Prof. Macnus on the Expansive Force of Steam. 
IV. Dr. Emmericn on Trilobites. 
V. Biot on the Employment of Polarized Light. 
VI. Prof. Dove on the Periodical Variations in the 
Pressure of the Atmosphere. 
VII. Recwautt on the Elastic Forces of Aqueous Vapour. 
VIII. ReGNavtt's Hygrometrical Researches. 
