84 Anniversary Address by Lord Rayleigh. 
BUCHANAN MEDAL. 
The Buchanan Medal is awarded to Mr. William Henry Power, C.B., 
F.R.S. Mr. Power’s services to Hygienic Science and Practice have extended 
over a period of more than thirty years, and have been of the most distin- 
guished kind. He has himself personally conducted successful enquiries into 
the causes of the spread of various diseases, and has obtained results which 
have proved of the greatest benefit to mankind. Moreover, in his lone con- 
nection with the medical department of the Local Government Board, he has 
planned and directed numerous general and local investigations whereby our 
knowledge of disease, and of the methods of coping with it, have been greatly 
increased. The medical reports issued by the Local Government Board, 
which are universally regarded as among the most important contributions 
of our time to this subject, have for many years past been either written by 
him or owe much to his editorial criticism and supervision. . It is not too 
much to say that no living man in this country has advanced the cause of 
scientific hygiene more than Mr. Power, or is more worthy of the distinction 
of the Buchanan Medal. 
