106 Salmon at the Antipodes. 



In the stream which runs close by, and 

 which is supplied by numerous springs, a con- 

 stant current runs at all times, and I have 

 by dams, one above another, retained in its 

 channel, the flood waters which would other- 

 wise ruu to waste, so as to keep up the supply 

 in the dry season. The channel of the brook is 

 a rocky glen or gorge, and in some places the 

 stream runs underneath large rocks and into 

 cavernous recesses, which lowers the tempera- 

 ture of the water, even in very hot weather, 

 most remarkably. I have found the water at 

 the surface of the dam 79 deg., and flowing 

 over the sluice gate at this temperature, but it 

 was reduced in a distance of 200 yards, lower 

 down the glen, at the hatching-boxes, to 57 

 deg. The bottom temperature of the dam 

 also, during all the early part of the summer, 

 keeps very low, being 55 deg. at five feet 

 beneath the surface, while the stream from 

 springs running into the dam was 80 deg., and 

 the surface stratum of water in it of the same 

 temperature. On making the discovery that 

 there was this difference of 25 deg. between 

 the top and bottom temperature, I arranged 

 to draw off the water from the bottom of 



