4 
Proceedings of the Eoyal Society 
heating purposes. The results below are therefore strictly pre- 
liminary and provisional. The difficulty of knowing the interior 
temperature, and especially of making sure that it has ceased to rise , 
during the measures, renders them very dubious. I hope soon to 
supply more trustworthy results. 
Temperature C. 
0°*5 
8°-0 
49° -0 
Mean Difference of Readings of Pressure Gauge 
for the same three successive Wires. 
14-5 
167 
177 
14-9 
17-5 
197 
24-6 
22‘0 
21*8 
If these at all represent the truth, they indicate a very curious 
result. But I draw no inference till I can repeat the work under 
more favourable circumstances. 
PRIVATE BUSINESS* 
The following Candidates were balloted for and declared duly 
elected Fellows of the Society: — Mr H. Bellyse Baildon, B.A. ; Mr 
Robert Chambers ; Dr Charles M ‘Bride* 
Monday, 15th December 1884. 
ROBERT GRAY, Esq., Vice-President, in the Chair. 
The following Communications were read : — 
1. On the Theory of the Tides. Part I* By 
Edward Sang, LL.D. 
2. On the Nature and Significance of the Structure known 
as Kupffer’s Vesicle in Teleostean Embryos. By Mr 
J. T. Cunningham, B.A. (Plates I., II.) 
The study of the development of the herring, of which the follow r - 
ing pages contain the first results, was commenced at the beginning 
