HERTFOKDSHIRE NATURAL HISTORY SOCIETY. 
XXI 
Acrocarpi. 
Dicranella heteromalla, Hedw. 
Dicranum scoparium , L. 
Barbula fallax, Hedw. 
Mnium hornum, L. 
Polytrichum commune » L. 
Pleurooarpi. 
Thuidium tamariscinum , Hedw. 
Brachythecium rutabulum , I. 
Purhynchium piliferum , Sckreb. 
Amblystegium serpens , Schpr. 
Hypnum cupressiforme , L. 
After partaking of tea, kindly provided by the Director and Mrs. 
Green, the return walk was commenced. The fine avenue of oaks 
and beeches at Red Heath (“ Pinch’s Avenue ”) was first passed 
through, and here the lesser periwinkle ( Vinca minor) was seen, 
and the coralwort again. Prom Red Hall the fields were crossed 
to Cassiobury Park, and Watford was reached by a rather different 
route through the Park from that taken on the outward walk. 
The following birds are reported by Mr. Henry Lewis as seen 
or heard during the walk :—song-thrush, redbreast, nightingale, 
greater whitethroat, chiff-chaff, willow-warbler, hedge-sparrow, 
coal tit, blue tit, nuthatch, tree-pipit, spotted flycatcher, swallow, 
martin, greenfinch, house-sparrow, chaffinch, yellow bunting, jay, 
starling, jackdaw, rook, skylark, cuckoo, turtle-dove, pheasant, 
common partridge, and lapwing. 
Pield Meeting, 26 th May, 1888 . 
ST. PETER’S, ST. ALBANS. 
Prom St. Peter’s Church, the place of meeting, the members, 
about twenty-five in number, under the guidance of Mr. A. E. 
Gibbs, crossed St. Peter’s Park into Sandpit Lane. On arriving at 
Hall Heath the Avenue was entered, and then Beaumont’s Parm 
was visited, and the traces of the moat which surrounded the 
mansion formerly occupying this site were viewed. The old house, 
Mr. Gibbs stated, was destroyed by fire about a century ago, and 
the three cottages at the entrance to the avenue, and also the 
Half-way House on the Harpenden Road, were built with bricks 
from its ruins. Hear its site an oak supposed to have been planted 
by Oliver Cromwell was growing until a few years ago, when it 
was destroyed by fire. In crossing the orchard the silver-moss 
(Bryum argenteum) was seen growing in profusion on the walls. 
The road to Marshall’s Wick was then taken for a short distance, 
and a circuit was made along the green lanes on the east into the 
same road a little further on. In a small pond that was passed, 
the Canadian pond-weed (Anacharis Alsinastrum ) was seen growing, 
and it seemed difficult to account for its presence so far from any 
large body of water or running stream. Introduced into England 
about forty years ago, this plant has spread so rapidly that it now 
chokes up rivers and ponds all over the country. 
On the return walk by Sandpit Lane the subterranean trefoil 
(Trifolium subterraneum ) was seen, and the curious habit it has of 
burying its seed-pods in the earth by the motion of its flower-stalk 
was remarked upon. 
On reaching St. Albans tea was kindly provided by Mr. Gibbs 
at his residence, The Hollies. 
