158 SALMONIA. [SIXTH DAY. 



only particular food and particular game at great 

 distances, but even makes of the smell a kind of 

 language; and I doubt not, that when dogs, that 

 have been blindfolded and carried away from their 

 home, return to it, it is by the sense of smelling, to 

 them each town, lane, or field, must have a particular 

 scent. A case has been related to me of a dog carried 

 in a covered basket from Badula to Kandy, a 

 distance of 45 miles, over a road he had never 

 travelled before, and who returned to the spot from 

 which he was taken in 24 hours, through the wildest 

 parts of the mountainous district of Ceylon. And I 

 have seen even a blind horse, an animal in which the 

 sense of smelling is less acute, evidently find his way 

 by it to his master's house and stable, which was, 

 indeed, near a tan-yard. The state of parts of water, 

 in the sea or great lakes, produced by the impregna- 

 tions carried down by particular streams, is much 

 more permanent than a like state in air; so that 

 though the knowledge given by the nasal organs may 

 be more easily communicated at a distance by winds, 

 yet that produced by streams on the branchiae of 

 fishes is more invariable, and a migratory fish is less 

 likely to be deceived. Yet in great floods, often 

 connected with storms, or violent motion in the 

 waters near the shore, salmon sometimes mistake 

 their river. I remember in this way, owing to a 



