101 
measurements, because the markings are not all on one plane; the 
length of the stride he was also unable to determine, in consequence 
of the impressions in the same line being all of the right foot. There 
are distinct marks of claws on several of the toes. 
A paper was next read, ‘‘ On the occurrence of numerous Swallow 
Holes, near Farnham; with some observations on the drainage of the 
country at the western extremity of the Hog’s Back,” by George 
Long, Esq., and communicated by C. Lyell, Esq., V.P.G.S. 
Farnham stands at the foot of the chalk hills, upon a deep bed of 
loam, which appears to overlie the gault. Upon the chalk, imme- 
diately to the north of the town, is the castle, beyond which the 
tertiary strata commence and rise to a considerable height, forming 
the great mass of hill known by the name of Farnham Beacon, Tun- 
bury, or the Lawday House. On the north side, this hill presents, 
for the greater part, an abrupt precipice, under which several streams 
are thrown out; but on the south there are landsprings only, which 
occupy the gullies for the greater portion of the year, and occasion- 
ally become formidable torrents. These rivulets pour down the 
tertiary clays until they arrive at the chalk, where they plunge into 
the ground and disappear, except during very heavy rains, when 
the surplus waters are carried off by gravely channels in the chalk. 
The principal object of the paper is to describe the seven swallow 
holes between Clear Park and Farnham Park, anda minute account 
is given of each. They occur in Clear Park—-Lower Old Park Gully— 
Clay-pit Gully—near the Potter’s Clay-pit—in the Hop-grounds, 
aboye the turnpike a little west of the Odiham-road—near the en- 
trance of the pleasure ground in Farnham Park—and near the end of 
the avenue at the east of Farnham Park. The water absorbed by the 
holes in Farnham Park is supposed to reappear at the Bourne-Mill- 
‘stream; and though soft where it sinks into the chalk, itis hard and 
unfit for use, where it again breaks forth. The existence of under- 
ground currents was further proved by a well sunk at Hale Farm, 
which gave the following section : 
Son duanehsnavel tie ihe eo aon Ua 6 feet. 
lay (potters!) 1. 8 Mies has A en Seeee Peon G: 
Ratle aMpretavel a Awe, 2) i iete ene Cea lD 
Playi(natters! Fished idk Sy AOS rahe 14 or 15. 
Clay, blue (London?) lowest 2 feeta green sand 24. 
Jelena clave Sad dts ose Us eect a 20 or 30. 
At that depth a spring was reached, which was supposed to be the 
Bourne-Mill-stream, and the instrument went down rapidly many 
fathoms, through a chalk mud. The well-sinkers afterwards came 
upon chalk with many flints, and finally breaking their instrument, 
left 80 feet of it in the earth, having bored altogether to a depth of 
176 feet. 
The green-sand tract, described in the second part of the memoir, 
and drained by a stream which flows northward through a gap in 
the chalk at Runfold into the London basin, is bounded on the north 
K 2 
