PEOCEEDINGS, tf ' - ' / 



CAMBRIDGE PHILOSOPHICAL ^°^'' 



OF THE 



SOCIETY. 



VOL. III. PART III. 

 [April to December, 1877] 



CONTENTS : 



PAGE 



Mr A. Schuster, On the passage of Electricity through Gases . 57 

 Mr Glaisher, O71 Theta Functions as definite Integrals , . 61 



Prof. Hughes, On the base of the Silurian system . . .67 



Mr Pearson, On some points in the history of Astronomy . . 70 



Mr Balfour, On the development of the Vertebrate Ovum . . 75 



Prof. LivEiNG, On the mefamorphism of the Rocks of the Channel 



Islands . ' . . . . . . . . 75 



Mr BosTisrEY, Notes on' the Geology of the Lizard . . .85 



Prof. Maxwell, On the Electrical Experiments of H. Cavendish . 86 

 Prof. Hughes, On the lyase of the Cambrian Rocks in N. Wales . 89 

 Lieut. Clarke, R.E., On a onethod of determining Velocities of Rotation 90 

 Prof. Liveing, On the Spectrum of Calcium Fluoride . .96 



PIIINTED AT THE UNIVERSITY PRESS. 



AND SOLD BY 



DEIGHTON, BELL AND CO. AND MACMILLAN AND CO. CAMBRIDGE ; 

 BELL AND SONS, LONDON. 



1878 



