Essays in Marine BiologyTHB RICHARD ELMHIRST MEMORIAL LBCTURES

CONTENTS: The Locomotion of Fishes by JAMES GRAY.—Fin Patterns andMode of Life in Fishes by JOHN E. HARRIS.—Aspects of Life on MuddyShores by c. M. YONGE.—Life on Some Sandy Shores by A. C. STEPHEN.—The World between Tidemarks by T. A. STEPHENSON.—Some Problems ofPelagic Life by ALISTER C. HARDY.—The Production of Animal Planktonin the Sea by s. M. MARSHALL and A. P. ORR. Illustrated 12s. 6d.

Biology of a Marine CopepodS. M. MARSHALL and A. P. ORR

A summary of the research conducted into the anatomy, life history,physiology and distribution of Calanus finmarchicus since its discovery in1767. In addition some original work is described and a mass of data hasbeen made available which was previously scattered in various scientificjournals. Illustrated 2\s.

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CSAPO, A. and WILKIE, D. R. The dynamics of the effect MORRISON, S. D. The total energy and water metabolismof potassium on frog's muscle. during pregnancy in the rat.

DOWSE, C. M., SAUNDERS, J. A. and SCHOFIELD B. The r ^ ^ D . R . , KIDD, B. S. L. and PATTERSON, G. C. Thecomposition of lipid from jejunal contents of the dog reactions of the blood vessels of the human calf toafter a ratty meal. increases in transmural pressure.

WILKIE, D. R. Measurement of the series elastic com- _ _ , , r- „ „ . . _ .ponent at various times during a single muscle twitch. JERVIS, E. LESLY, JOHNSON, F. R., SHEFF, M. F. and

i f & D £ S^&S^ST ^ ™alBISHOP, P. O. and EVANS, W. A. The refractory period of FURSHPAN, E. J. The effects of osmotic pressure changes

the sensory synapses of the lateral geniculate nucleus. on the spontaneous activity at motor nerve endings.DAY, MARGARET. The release of substances like acetyl- RITCHIE, J. M. and STRAUB, R. W. The after-effects of

choline and adrenaline by the isolated rabbit heart. repetitive stimulation on mammalian non-medullatedNIEDERGERKE, R. The 'staircase1 phenomenon and the fibres.

action of calciurnon the heart RITCHIE, J. M. and STRAUB, R. W. The effect of coolingNIEDERGERKE, R. The potassium chloride contracture of o n t h e s i z e o f t h e a c t i o n po t e n t i a i o f mammalian non-

the heart and its modification by calcium. meduUated fibres.HALLIDAY, A. M. and REDFEARN, J. W. T. An analysis of

the frequencies of finger tremor in healthy subjects. HEBB CATHERINE O. and SILVER, ANN. Choline acetylaseEDHOLM, O. G., FOX, R. H. and MACPHERSON, R. K. The J? <** « n t r a l n e r v o u s ****"> ° f m a n « n d s o m e ° t h e r

effect of body heating on the circulation in skin and mammals.muscle. ANDREW, B. L. The nervous control of the cervical

BRIDGES, C. D. B. The visual pigments of the rainbow oesophagus of the rat during swallowing.trout {Salmo irideus). STRANGE, PRISCILLA H. Pitch-intensity dependence and

SHEPHARD, R. J. Assessment of ventilatory efficiency by its relation to the threshold of hearing for big hthe single-breath technique. frequencies.

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Enzyme, Antigen and VirusSIR F. MACFARLANE BURNET

Sub-titled A Study of Macromolecular Pattern in Action, this monograph attemptsto find common factors in what is known about the production of adaptive enzymes,the stimulation of antibody production by antigens, and viruses. It provides auseful summary of modern work for biologists concerned with protein synthesis andrelated subjects. iSs. net

The Water Relations ofTerrestrial Arthropods

E. B. EDNEYThe central theme of this book is an inquiry into the various processes of water-uptake, the sources of water-loss, and the means by which a water-balance isachieved. Recent advances on these and related topics are summarized.

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VOL. XLIII (No. 289) ZOOLOGY 25 July 1956

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An Essay on Evolution and Modern Genetics. By H. GRAHAM CANNON,

F.R.S., F.L.S., Beyer Professor of Zoology, University of Manchester.

Observations on Flying and Flightless Water Beetles. By DOROTHY J.JACKSON, F.L.S., F.R.E.S.

A Note on the Biology of Brechites penis (L.) (Lamellibranchia). ByR. DENISON PURCHON.

The Structure and Biology of Vallicula multiformis, gen. et sp. nov., APlatyctenid Ctenophore. By J. J. RANKIN.

Systematic and Ecological Notes on the Cladocera of Lake Toba, andthe Surrounding Country, North Sumatra. By D. S. JOHNSON.

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