Plate XXVII. 



liu. 1. 



Smith's Salmon l,adder, 1840. 



Gradient one in sevoii. Inlet 2 feet wide and 2 feet deep, opening between each pool 1 foot wide. 

 "Water in each pool 15 inches deep. 



Fig. '2. 

 Flsliway (for salmon) at BalijsodiU'c, Ireland. 

 (After Roberts.) 



[Inclined I'Line; gradient 1 in 9.] 



g,^ I,,' :,l, .. 1 , 1. 



Length 174 feet: Slope I in 9. 

 Scale 1=48.' 



