202 
INDEX. 
Odell, J. W., on the potato disease, 
121 ; on fasciation in Campanula 
media , 192 ; on poisonous properties 
of Primula obconica, 193. 
Odsey Grange, record of water-level in 
a deep Chalk well at, 31. 
Offley, Great, well-section at, 56. 
Ophrys apifera and muscifera at 
Barton, xxxvi. 
Orchis latifolia, maculata, and ustulata 
at Barton, xxxvi. 
Ordinary meetings, reports of, 1889 , 
ix-xiv; 1890 , xiv-xv, xxii-xxviii, 
xxxii-xxxiii, xxxix-xlvi; 1891 , xlvi- 
li, lvii-lxi. 
Ormerod, Miss E. A., on cure of 
“ club ” in cabbage, 191 ; on 
Hymenoptera in locks, 196. 
Ornix fagivora in Herts, 75. 
Otterspool, Watford, visited, Ixvii. 
P. 
Papers, list of, read in 1889 , xvi; in 
1890 , liii. 
Park Street visited, xxxvii. 
Partridge, habits of, 4. 
Pasteur Institute, and rabies, ix ; 
described, xiii. 
Pasteur’s researches, xi. 
Percolation of rain through soil, lix, 
142; through light and heavy soil, 
175. 
Percolation-gauge, construction of, 137. 
Pewits in Herts, 91, 93. 
Phenological phenomena, investigation 
of, 43; observed in Herts in 1889 
and 1890 , 114 ; observations, simple 
method of taking, 117. 
Phenology of 1889 , 115; of 1890 , 116. 
Photographs, geological, exhibited, 
xxviii ; instructions for the collec¬ 
tion of, 50. 
Photography, art of, xxvi; geological, 
42 ; in Herts, 49 ; applied to meteoro¬ 
logy, 162. _ 
Ficus minor in Herts, 89; P. viridis 
in Herts, 127. 
Plant-life, nitrogen in relation to, 
xxxiv. 
Plant-records in Herts, 1886 - 89 , 74. 
Plants, cryptogamic, lists of, xxxviii, 
xxxix, Ixvii, lxix, Ixx; flowering, 
lists of, xxxvi, Ixvi, Ixvii; native, 
their extinction at Totternhoe, Ixiii ; 
investigation of their disappearance, 
42; to be observed, 120; diseases 
of, in Herts, in 1890 , 191. 
Plectrophanes Laponica in Herts, 89. 
Pochard at Munden, 125. 
Poisonous properties of Primula ob¬ 
conica , 195. 
Potato disease, dissemination of, 191. 
Potterells, swallow-holes at, xxix. 
Pre-historic remains, recording of, 42. 
President’s Address, 21 st Feb., 1890 , 
1 ; 16 th Feb. 1891 , 103. 
Primula obconica , poisonous properties 
of, 195. 
Puckeridge, well-section at, 60* 
Puffin near Totteridge, 124. 
Puttenham, well-section at, 60. 
B. 
Babies and the Pasteur Institute, ix. 
Badlett visited, xxxvi. 
Badwell, well-section at, 60. 
Bain, percolation of, through soil, lix, 
142; through light and heavy soil, 175. 
Bainfall, investigation of, 43 ; in Herts, 
in 1889 , 65; in 1880 - 89 , 85 ; in 
1890 , 181 ; at Hitchin, 1850 - 89 , 
73; mean in Herts for half-a-century, 
84, 139; for the present century, 
140; probable extreme variation, 140. 
Bain-gauge, construction of, 137. 
Eaven, in Herts, 92 ; habits of, 92. 
Bavensburgh Castle visited, xxxv. 
Beading Beds at Badlett, xxxvi; at 
Bennet’s End, lxii; at Ayot, lxv; 
at St. Albans, Ixviii. 
Beceipts in 1889 , xviii; in 1890 , lv. 
Bedbourn visited, xxxiii; well-section 
at, 61. 
Bemains, pre-historic, recording of, 42. 
Beport of the Council for 1889 , xv; 
for 1890 , lii; on the rainfall in Herts 
in 1889 , 65 ; in 1890 , 179 ; on phe¬ 
nological phenomena in Herts in 
1889 and 1890 , 114. 
Bickmansworth, rainfall at, in 1889 , 
67; in 1880 - 89 , 85; in 1890 , 181. 
Borins, Mr. and Mrs. Upton, reception 
of members by, lxv. 
Books, habits of, 94. 
Poorer, G.: Notes on Birds observed 
in Hertfordshire during the year 
1889 , xli, 89-96; . . . . during the 
year 1890 and the early part of 1891 , 
Iviii, 123-128. 
Bothamsted, Harpenden, visited, xxxiii; 
rainfall at, in 1889 , 67 ; in 1880 - 89 , 
85; in 1890 , 181; percolation of 
rain through soil at, 142. 
Boyston, rainfall at, in 1889 , 67; in 
1880 - 89 , 85; in 1890 , 181 ; clima¬ 
tological observations at, in 1889 , 
77; in 1890 , 187. 
Bye Common, well-section at, 61. 
