90 
named canal cost up to 1822, when it was opened, the sum 
of £905,258, but as I find in other works that its total cost 
was £986,924, I will proceed with my calculation upon this 
last amount, although less favourable. The writer in the 
Encyclopaedia has probably excluded from the total expendi- 
ture the cost of collateral works, such as bridges, roads, &c., 
which, strictly speaking, do not belong to the canal. 
" Each lock of the Caledonian canal cost, upon an average, 
£8,000 and therefore the whole 27 amounted to £216,000. 
" Deducting this sum from the total cost, it will appear that 
the 25 miles of canal cost, exclusive of the locks, £760,000 
and each mile £30,400. 
" Selecting the proper ground, the fall of the proposed 
canal is : 
From the table-land of Tarifa to the Pacific 660 feet. 
From the same point to the mouth of the Malatengo .... 525 feet. 
" Given to it a number of locks proportionate to that of the 
Caledonian canal, there would be required : 
On the side of the Pacific 89 locks. 
On the side of the Atlantic 72 ditto. 
Total number of locks ■ 161 
" But the number of locks depend in a great measure on the 
accidental form of the ground; and, these permitting, there 
might be given to each lock a fall of 10 feet in which case 
their number would be reduced 
On the Pacific side to 67 
On that of the Atlantic to 53 
In all 120 
" However, to come neaier to the existing data, and because 
it might be necessary to put one or more locks below the con- 
fluence of the Malatengo, we will suppose that the total num- 
ber of necessary locks is 1 50. 
" The length of our canal would be fifty miles. 
