OF THE SALMONID.E. 51 



about .£2000. There was, however, one 

 defect. The hatching boxes were not 

 water-tight ; consequently, when it was 

 necessary to shut off the turbid water 

 coming down in a fresh, the reservoirs 

 containing bright water were unable to 

 supply the loss in the boxes, and the ova 

 would soon be left dry. To remedy this 

 when the ova arrived would have involved 

 great loss of time, and would have en- 

 dangered the whole consignment. Mr. 

 Dawbin was therefore obliged to use the 

 imperfect -boxes, and make the best of them. 

 Prom twenty thousand to thirty thousand 

 healthy ova had been deposited on the 

 gravel, in the boxes, and all promised well. 

 When about five hundred fine young fry had 

 come out, a fresh set in, and lasted so long 

 ibat the reservoirs could not maintain the 

 waste through the leaky boxes, and Mr. 

 Dawbin was compelled to let in the flood 

 -water, in order to keep life in the ova and 

 fry.. The filter became choked with the 

 river sediments, and a layer of fine mud 

 settled down on the ova in the boxes. In 



