80 List (^Steam-Boats Bluing (m the River Clyde in 182S. 
Rock, anil resting upon it. They are stratified, the strata run- 
ning N. E. and S. W. nearly. At the foot of a range of pretty 
high hills, behind, or rather N.N. W. of Algeziras, and 10 
miles N. W. from Gibraltar, I found some masses of a large 
granular red and white sandstone, very like the old red sand- 
stone. These masses increased in number as I ascended the 
hills ; but as I did not proceed to the top, I did not discover 
the rock in situ. 
From the circumstance of the plague raging in different parts 
of Spain, at no great distance from Gibraltar, at the time of my 
visit to this place, no person was allowed to be absent from Gib- 
raltar longer than 24} hours, a time too short to admit of an ac- 
curate or extensive examination of this part of the country. 
Edinburgh, 1 
May 1822, j 
Art. XIII. — List of the Steam-Boats flying on the River 
Clyde in 1822. In a Letter from James Smith, Esq. 
F. R. S. E. to Dr Brewster. 
My Dear Sir, 
desire, I send you a list of the steara- 
vessds at present plying upon the River Clyde. The whole of 
them, except the Liverpool boats, sail from Glasgow to the 
ports specified in the 2d column ; the Liverpool boats go no 
farther up the river than Greenock. The 3d column contains 
the number of horse-power of the engines ; the 4th column the 
tonnage, from which the space occupied by the machinery is 
deducted ; and the last column contains the tonnage, calculated 
in the same manner as other ships. The boats which ply be- 
tween Glasgow and Greenock generally make two, and frequent- 
ly three trips a day ; and hitherto not a single passenger has Ipst 
his life, either from sea-risk, or the nature of the machinery. 
I am, my Dear Sir, yours always. 
Ja®. Smith. 
