ns Publisher will mail this Journal to any Address in the United States, for one year, on receipt of 
Post Office Order for 11s. 
No. 20. Series. Oct. 1881 . [2s. 6d. ! 
EDITED BY W. S. DALLAS, F.L.S. 
Assistant-Secretary of the Geological Society. 
CONTENTS. 
The Classification of the Eozoic and Lower Palaeozoic Rocks 
of the British Isles. By Henry Hicks, M.D., F.G.S., &c. (Illustrated.) 
On the Colours of Spring Flowers. 
By Alfred W. Bennett, M.A., B.Sc., F.L.S. , Lecturer on Botany, St. Thomas’s 
Hospital. 
On the Retreat of the European Glaciers. 
By Professor C. Dufour. 
The Storage of Electricity. By j. Munrd, c.e. (illustrated.) 
On the Formation of the Tails of Comets. By m. fate. 
Atyoida Potimirim, a Mud- eating Fresh- water Prawn. 
By Dr. Fritz Muller. 
The Mode of Action of Facetted Eyes. 
By Professor Sigmund Exner. 
REVIEWS. 
American Seaweeds — A Garden Wild — Illusions — A Dictionary of Chemistry 
— The Micrographic Dictionary — Glasgow Geology — The Microscope — Floating 
Germs — British Marine Mammals — North American Rhizopods. 
SCIENTIFIC SUMMARY. 
Astronomy — Botany — Chemistry — Geology and Pala? ontology — Mineralogy — 
Physics — Zoology. 
ILLUSTRATED. 
LONDON : 
DAVID BOGUE, 
3 ST. MARTIN’S PLACE, TRAFALGAR SQUARE. 
LONDON: PRINTED BY STRANGEWAYS AND SONS, TOWER STREET, UPPER ST. MARTIN’S LANE. 
First Series, edited by Dr. H. Lawson, may be had complete in numbers, price 
£7 12s. 6d. or, 15 Volumes, in cloth, £3 2s.; in half-morocco, £11 8s. 
