Contents. 
xi 
PAGE 
On the Disruptive Discharge of Electricity. By Alexander Marfar- 
lane, D.Sc., and P. M. Playfair, M.A., .... 721 
On the Wave-Forms of the Vowel Sounds produced by the Appa- 
ratus exhibited by Professor Crum Brown. By Professor 
Fleeming Jenkin, F.R.S., and J. A. Ewing, B.Sc., . . 723 
Notes on the Fungus Disease affecting Salmon. By A. B. Stirling, 
Assistant Conservator of the Anatomical Museum in the Univer- 
sity of Edinburgh. Communicated by Professor Turner, . .726 
On some New Bases of the Leucoline Series. Part I. By G. Carr 
Robinson, Esq., ... .... 732 
On the Crystallisation of Isomorphous Salts. By G. Carr Robin- 
son, Esq., ........ 732 
On a New Method for the Separation of Yttrium and Erbium from 
Cerium, Lanthanum, and Didymium. Part I. By J. Gibson, 
Ph.D., and R. M. Morrison, D.Sc., .... 734 
On certain Effects of Periodic Variation of Intensity of a Musical 
Note. By Professor Crum Brown and Professor Tait, . . 736 
Note on a Mode of Producing Sounds of very great Intensity. By 
Professor Tait, . . . . . . .737 
Donations to the Library of the Royal Society, . 178, 446, 739 
Index, ........ 767 
Errata to be corrected in Table at top of page 607 opposite. 
Column 1, second row of figures, for “ 286-75,’’ read “ 288.” 
ninth „ „ “573*50,” ,, “ 576.” 
Column 3, second „ ,, “ +0-60,” ,, “ -Q-65. 
>> ninth „ ,, “+1*20,” „ “-1*30.’ 
5) 
