NOTES ON THE 
NATURAL HISTORY 
OF 
HORNSEA MERE 
BY 
GEORGE BOLAM 
( Being the Report of the Yorkshire Naturalists' Union Wild Birds and 
Eggs Protection Committee's work in this area, with 
short notes on Spurn, Bempton, etc.). 
PRICE ONE SHILLING. 
NOTES ON 
THE BLUE-GREEN ALG/E 
With a Key to the Species of Oscillatoria and Phormidium. 
By Harold Wager, F.R.S. 
48 pages printed and ] 6 pages blank for additional notes, size small crown Hvo, 
neatly printed, and strongly bound in dark blue cloth with gilt lettering on back 
and side. 
2/6 net. Post free 2/8 net. 
CONTENTS. 
General Description of the Blue-Green Alg® ; Structure of the Cell ; Chlorophyll 
and other Colouring Matters ; Cell Membrane and Sheath ; Glycogen and its Form- 
ation ; Cell Division ; Reproduction ; Classification ; Key to Orders and Families ; 
Key to Genera of Oscillatoriaceae ; Key to Specimen of Oscillatoria and Phormidium ; 
Glossary ; Index to Species. 
LONDON : 
A. BROWN & SONS, LTD., 5 Farringdon Avenue, E.C. 
And at HULL and YORK. 
