290 MODE OF ASCERTAINING THE DISTANCE TRAVELLED. 7, 8 Sept. 
the greater wheel passed in a single, or rather in a certain number 
of, revolutions. This was done by measuring the track, which, for 
this purpose, gives a truer result than by taking the circumference 
of the wheel itself From these data, were constructed two tables. 
The one showed merely the distance in any number of revolutions ; 
and from this could readily be known the measure of any short 
space, by counting the number of times the wheel revolved, which 
were marked by a leathern thong that always remained tied round 
one of the spokes. The other table was used for showing the rate 
of travelling per hour, deduced from the observed number of revo- 
lutions made in one minute ; or, which is preferable, if circumstances 
would permit, in five. These observations were repeated during 
the day, as often as it was thought that any change took place in 
the rate, and immediately pencilled down in a small memorandum 
book which I always carried in my hand, or in my pocket ; and in 
which short notes were made to assist my recollection in the even- 
ing, when I sat down to record in my journal whatever had been 
thought worthy of notice in the course of the day. 
Numbers of that beautiful antelope, the Springbuck *, were seen. 
The dogs caught a young one, and also three hares. To the latter, 
a swarm of ticks f adhered. 
The variety of names by which it has been this antelope's fate 
to be called by different writers, is rather remarkable. % But Spring- 
bok by the Dutch, and Springbuck by the English, inhabitants of the 
Cape, is the common appellation ; and, therefore, that of Euchore, 
which was intended as a Greek translation of these, is here preferred 
for its technical name. It is easily distinguished from all the known 
species, by the very long white hair along the middle of the back, 
which lying flat, is nearly concealed by the fur on each side, and is 
expanded only when it takes those extraordinary leaps which first 
suggested its name. 
* Antilope EucJiore. 
f In appearance not differing from the Acarus Ricinus, Linn. 
\ A. Euchore. A. dorsata. A. saliens. A. marsupialis. A. pygarga. La Gazelle 
a. bourse sur le dos. La Chevre saiitante. Gazelle de Parade, and Springer Antelope. 
