PREFATORY NOTE. 
To apologise for the delay in the issue of this Report would be useless. It 
has been carried through with ail the speed possible compatible with 
accuracy of workmanship and the many other necessary calls on the time, 
not only of the Editor, but of each one of the many contributors. The 
Editor has no fear of being judged harshly by anyone who knows any- 
thing at all of the labour involved in the passing of such very highly 
technical and scientific matter through the Press. 
The Editor wishes to acknowledge the always courtesy, if not always 
promptness, of his many correspondents and contributors. His thanks 
are also due to Mr. Bateson, F.R.S., V.M.H., to whom much of the excel- 
lence and none of the faults of the present issue are due. Dut above all 
he wishes to express his vast indebtedness to the assistance rendered him 
by Mr. R. H. Hutchinson, the Society’s Librarian, without whose careful 
reading of the sheets every error now discoverable would have been 
multiplied ten times. 
Ww. W. 
VINCENT Seuane, Loxvoy, 
February 21, 1907. 
