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Price Is. 
[1887. 
TRANSACTIONS 
OF THE 
HERTFORDSHIRE 
NATURAL HISTORY SOCIETY 
AND 
FIELD CLUB 
EDITED BY JOHN HOPKINSON, F.L.S., F.G.S. 
YOL. IV. PART 5. 
CONTENTS I 
15. Anniversary Address—The Laws of Nature in Relation to Health. By the 
President, Professor John Attfield, Ph.D., F.R.S., F.I.C., F.C.S. 129 
16. The Habits and Economy of our Social Wasps. By F. Maule Campbell, 
F.L.S., F.Z.S., F.R.M.S.... 153 
LONDON: 
JOHN YAN VOORST, 1, PATERNOSTER ROW, E.C. 
HERTFORD: 
STEPHEN AUSTIN AND SONS, PRINTERS, FORE STREET. 
... 
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1887. 
