IV 
CONTENTS. 
NO. PAGE 
XVI. On a Modification of Pelouze’s Method for determining 
Nitrates. By Professor E. A. Letts and Florence 
W. Rea, ....... 168 
{Issued separately June 24, 1915.) 
XVII. Quaternion Investigation of the Commutative Law for 
Homogeneous Strains. By Frank L. Hitchcock. Com- 
municated by Dr C. G. Knott, General Secretary, . 170 
{Issued separately July 8, 1915.) 
XVIII. On the Functions which are represented by the Expansions 
of the Interpolation - Theory. By Professor E. T. 
Whittaker, F.R.S., ..... 181 
{Issued separately July 13, 1915.) 
XIX. On the Composition of Milk as affected by Increase of the 
Amount of Calcium Phosphate in the Rations of Cows. 
By A. Lauder, D.Sc., and T. W. Fagan, M.A., . . 195 
{Issued separately September 21, 1915.) 
XX. On a See-Saw of Barometric Pressure, Temperature, and 
Wind Velocity between the Weddell Sea and the Ross 
Sea. By R. C. Mossman, ..... 203 
{Issued separately September 21, 1915.) 
XXI. The Magnetic Quality of Iron and Steel as affected by 
Transverse Pressure. By Wm. J. Walker, B.Sc. Com- 
municated by Professor W. Peddie, . . .217 
{Issued separately , 1915.) 
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