188 JOURNAL, NATURAL HIST. SOCIETY OF SIAM Vol. I. 
out the land leeches, and the coolies, who are as a rule rather leisurely 
on the march, fairly raced through the valleys, halting only on rocks in 
mid-stream to pull or scrape the leeches off. Later in the season the 
coolies became more expert, and on the march carried a stick apiece, to 
the end of which they tied ona tiny bag containing tobacco, pounded 
chilies, and red lime. This dabbed on a leech had the effect of instantly 
shrivelling it up. From observation I think these worms are very 
sensitive to, and hunt or are attracted by, vibration, making no use 
of their rudimentary eye spots. Keeping quite still, and with ten 
or more leeches in sight standing erect, slowly waving their heads 
about, I stamped my foot, when they would all advance towards me, but 
would then stop in doubt, unless the stamp were repeated. The young 
appear in May or June and are a great nuisance in July, being then 
only the size of needles, and can get through lace holes in boots and 
crevices in putties with ease. 
The camp in the valley was some 400 metres above sea level, 
shut in on all sides by mountains of 1200 to 1300 metres elevation, and 
two hours after arrival in camp the Huey Sat Yai rose some five feet 
and became quite impassable. I obtained here a Rail which I believe 
to be Rallina superciliaris, and which seemed to me quite out of place 
in dense forest, nor have I met the bird elsewhere. 
On the return journey heavy rain fell on the 4th April. On the 
5th my dogs picked up the scent of a tiger off the shrubs aud bushes 
bordering on the path, and, as the scent got hotter, off the path itself ; 
this was 9 a.m. and it became apparent that the tiger was going down 
fora morning drink at a rock pool just ahead. I crawled round the last 
bend hoping to see the beast drinking, but found two Karangs having 
breakfast there, and.they informed me that on sight of them the beast 
had bolted up the hillside. Tigers have recently been giving some 
trouble in the coast districts of Ratburi, but I do not know of any 
authentic case of molestation by tigers among the hundreds of coolies 
who have been employed by the Survey Department in the wild parts 
of Ratburi. They have taken an inquisitive interest in our doings and 
eaten our transport mules; and on one occasion a tiger walked all 
round and between a party of four coolies sleeping out ona sand bank, 
but they knew nothing of its presence till morning. 
On the 15th April I left headquarters camp for a trip to the 
head waters of the Bang Kloi river, and on the 3rd day out arrived 
