48 Salmon at the Antipodes. 



from 55 cleg, of latitude — descends but little 

 beyond 42 deg. ; which explains its absence 

 from the waters of the Mediterranean — the 

 Straits of Gibraltar being about the 36th 

 parallel — and also in America from the streams 

 falling into the Gulf of Mexico. 



" The Salmo quinnat, on the contrary, is 

 abundant about 35 deg. of latitude, and is 

 found beyond 30 deg., which gives good 

 reason to think that it may be acclimatized in 

 the valley of the Mississippi. . . . 



" The Californian salmon will bear very 

 great heat without inconvenience. In July and 

 August it is seen in great shoals on the San 

 Joaquin, which river it ascends to a distance 

 of about 100 miles through the warmest valley 

 in California, where the temperature of the 

 air, rarely below 75 deg. at noon, is often up 

 to 104 deg. As to the water of the river, it 

 reaches sometimes 82 deg. at the surface, and 

 80 deg. near the bottom. No other species of 

 migratory salmon lives in latitudes so far 

 South as this one. Mr. Eedding, of the 

 Californian Fish Commission, states that in 

 July and August, when salmon are most abun- 

 dant, the mean temperature of the San 



