842 
X-rays, the transmission of, through 
metals, by H. B. Keene, 403. 
Bragg, 386. 
“s discussion on, 404. 
*X, and the evolution of helium, by Sir 
J. J. Thomson, 403. 
Yaprr (Prof. R. H.) on the vegetation of 
Ditcham Park, Hampshire, 266. 
on the registration of botanical 
photographs, 267. 
Yates (H. J.), recent progress in gas- | 
fire science, 435. 
INDEX. 
| Yorkshire, the Jurassic flora of, report 
on the investigation of, 264. 
and crystals, paper by Prof. W. H. | Youna (Prof. Sydney) on dynamic iso- 
merism, 141. 
Zoological Section, Address by Dr. H. F. 
Gadow to the, 500. 
Zoological station at Naples, report on the 
occupation of a table at the, 153. 
Zoology organisation, report on, 154. 
| Zygnema ericetorum and its position in 
the zygnemacee, by Prof. G. S. West 
and Miss C. B. Starkey, 716. 
