[ Vi ] 
XXXIV. On the Construction of Ufe-TMes, illustrated hya 
Healthy Districts of England. 5?/ W. Farr, -E sg., • 
XXXV Photo^chemical Researches.-V^ri IV. By Robert Bunsen, Professor of^ 
m^y at the U^rersity of HeideWerg. and Henry Eneieeb Eoscoe, R.A, Ph.H, 
Professor of Chemistry at Owens College, Manchester 
927 
Index 
Appendix. 
. r 1 ] 
Presents . 
