March] 
Price Is. 
[1892. 
TRANSACTIONS 
OF THE 
HERTFORDSHIRE 
NATURAL HISTORY SOCIETY 
AND 
FIELD CLUB. 
EDITED BY JOHN H OP KINS ON, F.L.S., F.G.S. 
VOL. VI. PART 7. 
CONTENTS : P AOE 
Proceedings, Session 18.89-90 .... i ..... ix 
Rabies and the Pasteur Institute. By John Evans, D.C.L., LL.D., Sc.D., 
Treas. R.S., Pres. S.A., etc.;..'......;.... ix 
Report of the Council for 1889............. xv 
Balance Sheet for 1889............ xviii 
Additions to the Library in 1889.....!....... xix 
The Art of Photography. By S. Monckton White ... xxvi 
Reports of the Field Meetings in 1890 ...... xxix 
The River Colne and the Swallow-holes at Potterells. By John Hopkinson, 
F.L.S., F.G.S., F.R.Met.Soc. .. xxix 
Proceedings, Session 1890-91 ....... xxxix 
LONDON: 
GURNEY & JACKSON, Successors to YAN YOORST, PATERNOSTER ROW. 
HERTFORD: 
STEPHEN AUSTIN AND SONS, PRINTERS, FORE STREET. 
