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William Collins
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First published 1974
This eBook edition published by William Collins in 2019
© H. R. Hewer 1974 The author asserts his moral rights to be identified as the author of this work
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Source ISBN 9780007311118
Ebook Edition © FEBRUARY 2019 ISBN: 9780007406463
Version: 2019-02-13
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Page numbers taken from the following print edition: ISBN 9780007311118
EDITORS:
Margaret Davies C.B.E. M.A. Ph.D.
Sir Julian Huxley F.R.S. M.A. D.Sc.
John Gilmour M.A. V.M.H.
Kenneth Mellanby C.B.E. Sc.D.
PHOTOGRAPHIC EDITOR:
Eric Hosking F.R.P.S.
The aim of this series is to interest the general reader in the wild life of Britain by recapturing the inquiring spirit of the old naturalists. The Editors believe that the natural pride of the British public in the native fauna and flora, to which must be added concern for their conservation, is best fostered by maintaining a high standard of accuracy combined with clarity of exposition in presenting the results of modern scientific research.
1. Fur-seals fanning themselves (C. Bertram)
Head of grey seal
Head of Californian sea-lion
2. Porth Laoug, Ramsey Island, Pembrokeshire
Beach on Eilean nan Ron, Oronsay, Inner Hebrides
3. Shell-sand beach and herd of grey seals, Shillay, Outer Hebrides
Breeding rookery in wallows, Shillay, Outer Hebrides (R. Atkinson)
4. Breeding rookery in central Fianuis, North Rona (J. M. Boyd)
Ring-marking a moulter, North Rona (J. M. Boyd)
5. Shore rookery, Muckle Greenholm, Orkney (J. Woolston)
Breeding rookery, Staple Island (and Brownsman), Farne Islands (J. C. Coulson)
6. Aerial view of Gasker, Outer Hebrides (W. St. C. Reid in Boyd, J. M. 1957)
Bull and cow grey seals at wallow, North Rona
7. Territorial grey seal bull, Brownsman, Farne Islands
Breeding grey seal cow, Brownsman, Farne Islands
8. Longitudinal section of root of canine tooth of grey seal
Two canine teeth from 1st year grey seals
Two adult canine teeth (bull and cow) grey seals
Cement layers in tooth of 8-year-old grey seal
Cement layers in tooth of 18-year-old grey seal
9. Section of immature testis of grey seal
Section of mature but resting testis of grey seal
Sections of mature and active testes of grey seal
10. Section of immature epididymis of grey seal
Section of mature but resting epididymis of grey seal
Section of mature and active epididymis of grey seal
Abdominal testis in ‘82-day’ foetus grey seal
11. Section of ovary with developing oocytes, grey seal
Right and left ovaries in section, grey seal
12. Free blastocyst in utero, grey seal (R.Cox)
Young embryo (c. 31 days), grey seal
Early foetus (c. 55 days) in utero, grey seal
13. Early male foetus (c. 62 days), grey seal
Young male foetus (c. 72 days), grey seal