IV 
CONTENTS. 
A Contribution to the Study of the Excretion of Allantoin 
in Thymus Feeding. By W. M ‘Lachlan, M.D. (From 
the Research Laboratory of the Royal College of 
Physicians , Edinburgh .) (Communicated by Dr D. 
Noel Paton), ..... 
{Issued separately March 29, 1906.) 
On the Formation of certain Lakes in the Highlands. By 
Dr Leon W. Collet, F. Swiss G-eol. S., Assistant to 
Sir John Murray, K.C.B., and Dr T. N. Johnston, 
F.R.S.E. With a Note on Two Rock Basins in the 
Alps, hy Dr Leon W. Collet, 
{Issued separately April 16, 1906.) 
On the Distribution of the Proper Fractions. By Duncan 
M. Y. Sommerville, D.Sc. (Communicated by Prof. 
Chrystal), ...... 
{Issued separately April 16, 1906.) 
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