Royal Society. 67 
large river, in many places nine miles over, it is navigable near 
two hundred miles ^ the other rivers are each much about three 
miles over 5 and ^ames river is navigable at leaft 80 miles 5 within 
four or five miles of James town, James, river, and Tork river, 
are not above four or five miles alunder; and (loops of confiderable 
burthen may fail up the branches of the two rivers, till they come 
within a mile of each others Tork river is diftant from' Rapa- 
hamcky in fome places, not above 10 or 12 miles 5 Rapabanack 
from 'Totomack not above fevcn miles in one place, tho' it may 
be ^o in others 5 the heads of the branches of the rivers interfere, 
and are locked the one within the other : The tides in thefe 
rivers ebb and flow regularly about two foot perpendicular at 
James town y and it flows there, tide and half tide: As far as 
the fait waters reach, the country is reckoned hil healthy 5 in 
the fre flies they are more rarely troubled with the feafonngs, and 
thole other endemical diftempers about September ^nd OSloI^er: 
It is remarkable in Virginia^ that generally twice a year, viz, 
fpring and fall, at certain Ipring-tides, moft of the cattle will run 
to the river, tho' 20 or 50 miles off, to drink the fait water, at 
which time there is no flopping of them : In general, the waters 
in their fprings are fomewhat more eager than thofe in England^ 
for they require a greater quantity of malt to make flcong beer 
than our JEngllJIi waters, and they will not bear foap. 
TrufiBes3 hy 2)r. Tancred Robinfon. Phil. Tranf. N° 202. 
p. 824. 
TH E ^libera T'erroe, obferved at Rupton in Northampton- 
Jhire^ are the true French truffles, the Italian 'Tartt^ffi, or 
T'artujfole, and the Spanijh Turmas de T'ierra-^ at Florence^ 
Rome^ and NapleSy_ they are thrice larger, where they eat them 
as great dainties, either fried in flices with butter or oil, f.ilt and 
pepper, or elfe out of pickle, and they are often boiled in their 
Ibup: Theie oblerved in England^ are all included in a ftudded 
bark or coat, the ^I'liber rules refembling the Capfides or feed- 
veflels of fome mallows and AlCi^aSj the internal lubilance is of 
the confidence of the flefhy part in a young chefnut, of a pale 
colour, of a rank fcent and unfavoury, llreaked with many white 
veins or threads ^ the whole is of a giobous figure, tho' unequal 
and chinky : What thefe truffles are, neither ancients or moderns 
have clearly informed us ; fome will have them to be callofities, 
or warts bred in the earthy others call them fubterraneous 
mufhrooms j they are mofb tender in ;he fpring, tho' after fhowers 
and fultry weather, they may be plentifully found in autumn 5 
I. z moifture 
