TABLE OF CONTENTS. 
NEW SERIES, VOL. III., PART I. 
PAGE. 
Some New Optical Illusions. Sylvanus P, Thompson, B.A., D.Sc., 
F.R.A.S. ... ... ... ... ... I 
Underground Temperature. E. Wethered, F.C.S., F.G.S. ... 9 
The Structure and Life-History of a Sponge. W. G. Sollas, M.A., 
F.R.S.E, F.G.S., &c. 
20 
On some Cases of Prolification in “ Cyclamen Persicum 
Leipner, F.Z.A. 
Adolph 
38 
The Ethnology of the Paropamisus, or Hindoo Koosh. John 
Beddoe, M.D., F.R.S. 
39 
Catalogue of the Lepidoptera of the Bristol District. 
Hudd, M.E.S. ... 
Alfred E. 
42 
The Fungi of the Bristol District, Cedric Bucknall, 
Mus. Bac. 
60 
The Pomarine Skua. H. Charbonnier. 
71 
Rainfall at Clifton in 1879. George F. Border, M.D., F.M.S. 
73 
Annual Report 
76 
Balance Sheet 
79 
Reports of Meetings ... 
So 
