318 REPORTS ON THE STATE OF SCIENCE.—1912. 
No. 22. SPECIMEN OF RUBY MUSIC BY R. H. STEVENS & Co. 
Correspondence relating to the subjects dealt 
with in this report should be addressed to the 
Hon. Secretary of the Eyesight Committee. 
Intending purchasers should apply to the 
ASSISTANT SECRETARY, 
BritisH ASSOCIATION, 
BuRLINGTON House, 
Lonpon, W. 
