16 Journey of a Mahomedan Priest. 
thatched with grass, after the manner of those on the west coast 
of Africa; some ofthe streets are straight, and some winding. 
By digging two or three feet in the sand outside of Houssa, 
water can always be procured, but mud is no where to be met 
with in that country. The congwa is procured in Bornou, dur- 
ing the dries, from a place where water lodges to the depth of 
about nine inches in the rainy season ; it is like fine flour, and 
lies from twelve to fifteen inches thick along the ground, from 
whence it exudes so profusely, that if a space of 200 yards is 
cleared in the afternoon, next morning at the spot as much may 
be gathered as will fill ten baskets. There is also a sort of red 
conewa, which is dug out of the ground in lumps, and tastes 
exactly like the white. It is bought in Bornou for fifty cowries 
an ass load, and sold in Goingia for 3,000, 
[Collected from Serjeant Frazer, 2d West India regiment, who was born 
in Houssa, and resided there for a long time, was taken prisoner in Goingia, 
and brought to the Gold Coast, where he was sold. ] 
Art. IJ. Extract of a Letter from Grorcre PouLetr 
Scrore, Esq., to Mr. Brande, respecting the Geology 
of the Paduan, Vicentine, and Veronese Territories. 
Dated Como, June 21, 1822. 
On quitting Milan I took the direction of Venice; but was 
prevented by the early heat from residing for some time, as I 
had wished, in the Padovano, Vicentino, and Veronese. Seve- 
ral excursions, however, through these districts afforded me 
the opportunity of making a few interesting observations, some 
of which have never to my knowledge been made public. 
I am not aware of the state of opinion prevailing amongst the 
English geologists of the present day, with respect to the trap- 
rocks of this country, whether their volcanic origin is disputed 
by any, or, like those of Auvergne, the Rhine, and western 
Italy, tacitly or openly acknowledged by all. The scientific 
writers of Italy also have long been strangely silent upon the 
geological facts presented by these regions. No one has 
