IV 
CONTENTS. 
NO. PAGE 
X. The Structure of the Reproductive Organs in the Free-Martin, 
with a Theory of the Significance of the Abnormality. 
By D. Berry Hart, M.D., etc., Edinburgh. (With Two 
Plates), ....... 230 
{Issued separately February 11, 1910.) 
XI. On Waves in a Dispersive Medium resulting from a Limited 
Initial Disturbance. By George Green, M.A., B.Sc., 
Assistant to the Professor of Natural Philosophy in the 
University of Glasgow. ( Communicated by Professor A. 
Gray, F.R.S.), ...... 242 
{Issued separately February 18, 1910.) 
XII. On an Electrically Controlled Thermostat and other Apparatus 
for the Accurate Determination of the Electrolytic Con- 
ductivity of Highly Conducting Solutions. By John 
Gibson, Ph.D., and G. E. Gibson, B.Sc., . . . 254 
{Issued separately February 18, 1910.) 
XIII. The Theory of Orthogonants in the Historical Order of 
Development up to 1860. By Thomas Muir, LL.D., . 265 
{Issued separately , 1910.) 
The Papers published in this Part of the Proceedings may be 
had separately , on application to the Publishers, at the follow- 
ing prices : — 
No. VII., 
No. VIII., 
No. IX., 
No. X., 
No. XI., 
No. XII., 
No. XIII., 
Price Is. Od. 
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