IV 
CONTENTS. 
PAGE 
, XVII. Studies in Clocks and Time-keeping : No. 2. Tables of the 
Circular Equation. By Professor R. A. Sampson, F.R.S., . 169 
( Issued separately October 3, 1918.) 
XVIII. The Quadratic Relations between the Determinants of a 
4-by-8 Array. By Sir Thomas Muir, LL.D., F.R.S., . 219 
{Issued separately ,1918.) 
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