VI 
CONTENTS. 
PAGE 
15. Anniversary Address. By the President, Professor John 
Atteield, Ph.D., F.B.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.B.M.S.153 
17. notes on Birds observed in Hertfordshire during the year 
1886. By John E. Littleboy .. 161 
18. Meteorological Observations taken at Wansford House, 
Watford, during the year 1886. By John Hopeinson, 
F.L.S., F.G.S., E.B.Met.Soc. .169 
19. Beport on Phenological Phenomena observed in Hertford¬ 
shire during the year 1886. By John Hopkinson . . 176 
20. The Hessian Fly. By F. Maijle Campbell, F.L.S., 
F.Z.S., F.B.M.S., F.E.S. ..180 
21. A Naturalist’s Calendar for the northern Border of Hert¬ 
fordshire. By H. George Fordham, F.G.S.193 
22. Observations on Diatomacese from the neighbourhood of 
Hertford. By Isaac Bobinson .196 
23. Beport on Insects observed in Hertfordshire in 1886. By 
F. W. Silvester, F.B.Met.Soc.201 
24. Meteorological Observations taken at Watford during the 
year 1877. By John Hopeinson, F.L.S., F.G.S., 
F.B.Met.Soc.. . . . . .. .. . . 205 
25. Meteorological Observations taken at Throcking, Herts, 
during the year 1886. By the Bev. C. W. Harvey, 
M.A., F.B.Met.Soc. . . . . .209 
26. Beport on the Bainfall in Hertfordshire in 1886. By the 
Bev. C. W. Harvey .214 
27. Miscellaneous notes and Observations — Meteorology, 
Botany, and Zoology .221 
Index. 225 
Pi teedings, October, 1885, to October, 1887, pp. ix-lii. 
[To be inserted, in binding, before the ‘ Transactions.’] 
