4 
INDEX* 
Y page 
Young, Thomas, M. D. The Bakerian Lecture. On the theory 
oflight and colours, - - - 12 
— An account of some cases of the pro- 
duction of colours, not hitherto described, - 387 
— - — Remarks on some experiments of his, 4 
Z 
Zircon , remarks on, • • - - 298 
From the Press of 
W. BULMER & Co. 
Cleveland- Row, St. J ames's. 
m, 
