{ mo ) 



J Tour to the South of Fi-ance and the Pyrenees^ in the year 

 1825. ByG.A. Walker AiiNOTT, Esq. F.L.S.&c. Con- 

 tinued from page 325. of Vol. V. 



On the 3d July, having procured a couple of mules, and 

 having loaded them with ten or twelve reams of paper, and 

 other necessaries for a fortnight's excursion, we took the road 

 to Seo d'Urgel. 



Having passed through Cerdagne, we arrived the same after- 

 noon at Bourg- Madame (formerly called the Guingettes), a 

 French village on the frontier, and close to the Spanish town of 

 Puycerda. 



Next morning we left this place, and arrived at Seo d'Urgel 

 in the evening, after a march of thirty-four miles *, over a road 

 rough and difficult even for foot-passengers. The picturesque 

 nature of the country, and the great variety of plants that we 

 saw about us, made us regret that we could not devote more 

 time to the excursion, which we were prevented from doing, by 

 a particular circumstance, which it is unnecessary here to men- 

 tion. 



Notwithstanding the disadvantages we laboured under be- 

 tween Mont Louis and Seo d'Urgel, we made some interesting 

 additions to the Flora of the Pyrenees. Close to Salliagouse in 

 Cerdagne, we discovered Trrfbllum parvifloruvi ; and further 

 on, near Bourg-Mac^ame, we met with Trigonella polycerata 

 and Sisymbrium IcEvigatum. This last plant was originally 

 described by Willdenow, who remarks that it has all the habit 

 of *S'. asperum, but that the siliquae are glabrous : he only knew 



that nearly thirty times the power was requisite to give three times the ve- 

 locity. Farther, it may be quite true that, if a power of 5^ horses gives a ve- 

 locity of three miles to any boat, the table may be correct up to perhaps six 

 knots, or near it ; because, thus far, I have no doubt that the resistance de- 

 pends more on the weight of a boat than on its form, (see p. 236). But, be- 

 yond this, it is equally certain that form has a great influence ; and thus, that 

 one of two boats which has previously coincided, may acquire a velocity of 

 ten knots with a less power than 200 horses, and the other may not be sus- 

 ceptible of it with almost any power whatever. 



• Mr Bentham states " about twenty lieues du poste ,•" but the actual dis- 

 tance is only fourteen post leagues, or thirty-four English miles. 



