Prince. — A New Form of Fishway 173 



the outer door lifts up, and the fish can enter. There are indeed 

 three doors to this elevator. One is at the back, which opens 

 only when the compartment is at the top of the structure, and the 

 fish find exit by it. The second door is at the front of the com- 

 partment, and opens only when the compartment is at the bottom 

 of the elevator, and thus admits the fish, and a third door at the 

 bottom of the elevator which drops down only when the com- 

 partment has ascended, and thus prevents fish from entering the 

 space left vacant when the compartment is going up or down. 



OBJECTIONS ANSWERED. 



The only objections which have been raised to this device are 

 objections which are not really of very great force. Reference 

 may be made to one or two of them. Thus, it is claimed, that the 

 fish-elevator affords no means for the descent of adult fish after 

 spawning, or of the young fish. Young fish can overcome all 

 difficulties, however, in descending streams, and they can be 

 trusted to look after themselves; the main purpose is to enable 

 the parent fish to ascend to the spawning grounds. It has also 

 been objected that the fish might be damaged when being lifted 

 out of the water, and carried up in the fish-trap or wire-compart- 

 ment; but inasmuch as salmon and other fish damage themselves 

 considerably in jumping precipitous falls, there can be little harm 

 to the fish during the few seconds occupied in being carried up 

 to the top of the elevator. It has been objected, also, that logs 

 and floating debris, and especially an excessive flow of water, 

 might damage the fishway, but as a rule it would not be placed in 

 position until the logs and high water have disappeared, and to 

 avoid danger, it could be safely placed at one side of the obstruc- 

 tion. It need not be placed against the dam or falls, but at 50 

 or 100 yards away, and longer or shorter horizontal sluices con- 

 structed to carry the fish from the top of the elevator to the water 

 above. 



ADVANTAGES SUMMARISED. 



To summarise the advantages possessed by this elevator 

 fish-pass, which has been protected by patent in the United States, 

 it may be claimed that it is (1) suitable for every kind of fish 

 which ascends rivers. (2) It is not affected by freshets or by 



