vi Contents. 
On some fossil plants from the Devonian rocks of North Devon. By H. A. 
NewkE__ Arper, M.A., Sc.D., F.G.S., and R. H. Goons, B.A. 
(Three figs. in Text.) (Plates IV—V) . : : 
On some new and rare Jurassic plants from Yorkshire: The male flower 
of Williamsonia gigas (Lind. and Hutt.) Py H. Hamsaaw 
Tuomas, M.A. (Two figs. in Text.) (Plate VI) . 
Calculation of the electrical resistance of a certain network of conductors. 
By G. F. C. Saris, Sc.D., F.R.S. (Two figs. in Text) 
The determination of the focal length of a thick mirror. By G. F. C. 
SEARLE, Sc.D., F.R.S. (Six figs. in Text) : : ; 
On the Electrification given to the Air by a Steam Jet. By W. A. Douetas 
Rupes, M.A. (Four figs. in Text) . : : ae 
Note on Dr Searle’s experiment on the harmonic motion of a rigid body. 
(Proceedings of the Cambridge Philosophical ee November 24, 
1913.) By Sir GEorGE GREENHILL. B ; ‘ 
Further Experimental Researches on Insect Flagellates introduced into 
Vertebrates. By H. B. Fantuam, D.Sc., M.A., and ANNIE PORTER, 
D.Sc. ; : “i 
The Ketodilactone of Benzophenone-2-4-2'-4'-tetracarboxylic Acid. (Pre- 
liminary Note.) By W. H. Minus, M.A. : SL ‘ é 
_ Proceedings at the Meetings held during the Session 1914—1915 . 
Experiments with a prism of small angle. By G. ¥. C. SEARLE, Se.D., 
F.R.S. (Thirteen figs. in Text) ; : : 5 : » 
Examples illustrating the use of Integral forms. By R. HARGREAVES, M.A. 
The resolution of asymmetric quinquevalent nitrogen compounds. By 
Jos. Rettuy, M.A., M.Sc. (Communicated by Professor PoP) . 
On a little-known concealed coalfield in Oxfordshire. By EK. A. NEWELL 
ARBER, Sc.D., F.G.S. é : : ; ) ; 
Notes on Certain Protozoa which may be found in cases of Dysentery 
from the Mediterranean War Zone. By H. B. Fanruam, D.Sc, 
and Anniz Porter, D.Sc. : : : u : : 
On Induced Herpetomoniasis in Birds. By H. B. Fantuam, D.Sc., 
and ANNIE PortTER, D.Sc. : ; : : ‘ ‘ 
The determination of the effective aperture of the stop of a photographie 
lens. By G. F. C. Staruz, Sc.D., F.R.S. (Seven figs. in Text) 
