CONTENTS 



SECTION A.-MATHE:\rATIGAL, ASTRONOMICAL, AND PHYSICAL 



SCIENCE. , 



PAGE 



Conway (Aethuk W.), M.A., D.Sc, iI.E.I.A. :— 



On the Application of Quaternions to some Recent Developments of 



Electrical Theory, ...... 1 



Egan (Rev. Michael F.), M.A. : 



The Linear Complex, and a certain class of Twisted Curves, . 33 



McClelland (.John A.), D.Sc, F.R.S., M.R.I.A., and .J. .J. Nolan, M.A., 

 M.Sc.:— 



The Electric Charge on Rain, . . . . .81 



Nolan (J. J.), M.A., M.Sc. :— 



See under McClelland (John A.). 



Obk (William M'Fadden), M.A., F.R.S., M.R.I. A. :— 



Extensions of Fourier's and the Bessel-Fourier Theorems, . . 10 



Rogers (Reginald A. P.), F.T.C.D., M.R.I.A. :— 



Some Differential Properties of the Orthogonal Trajectories of a 

 Congruence of Curves, with an Application to Curl and 

 Divergence of Vectors, ...... 92 



