LIST OF ILLUSTRATIONS. 789 



Plate XXIV. Foster's fish-way at Union Mills, Saint Croix River, 18G7, (i)p. 613, GIG.) 



Fig. 1. Plan of location. 



Fig. 2. Plan of fish-way ; E, upper end of the fish-way, where the water enters ; 

 G, lower end offish-way, where fish enter ; H, tail-race ; a a, side-walls 

 offish-way; h h, cross- walls or hulk-heads; d d, passage-ways. 



Fig. 3. Same; side-elevation. 



Fig. 4. Cross-section, showing shape of passage-ways ; letters same as in No. 2. 

 Plate XXV. Fish-way at Brownville, Me., designed by E. A. Brackett, 1873. Scale- 



16 feet to an inch ; gradient, 1 in 10. 

 Plate XXVI. Fish-ways on the Saint George River, at Warren, Me., (p. 695.) The old 

 fish-way became useless because the fish (alewives) passed by it in the 

 stronger current and crowded up under and near the flume/; the 

 new fishway was built, and, though it was narrow and steep, great 

 numbers of fiish passed through it. 



Fig. 1. rt, dam ; &, old fish-way ; c, new fish-way ; d, entrance for fish ; /, flume ; 

 g, mills ; Scale about 30 feet per inch. 



Fig. 2. h, side-walls ; Jc, cross- walls ; I, curb ; I', another position for / ; m, pas- 

 sage-ways ; n, shelf. Scale about 5 feet to an incli. 



Fig. 3. Section of portion of fish-way ; letters same as in Fig. 2. 

 Plate XXVII. Fig. 1. Smith's salmon-ladder, 1840 ; gradient, 1 in 7 ; inlet, 2 feet wide 

 and 2 feet deep; opening between each pool, 1 foot wide; water 

 in each pool, 15 inches deep. 



Fig. 2. Fish-way (for salmon) at Balisodare, Ireland. (After Roberts.) (pp. 

 597-.j'JJ, 605, 603.) Inclined plane ; gradient, 1 in 9. 



Plate XXVIII. Brackett's fish-way, closed, perspective view, (p. 612.) 

 Plate XXIX. Pike's fish-way, (p. 609.) 



Fig. 1. Perspective view with portions of outer walls removed to show ar- 

 rangement of interior ; this view represents a fish-way with two 

 complete circuits and a portion of a third circuit, accomplishing a 

 total descent of about 9 feet ; if the height to be surmounted were 

 10 feet, the outlet would be on the left-hand side. 

 Fig. 2, Ground-plan of Pike's fish- way ; scale, 1 foot to f of an inch ; arrows 

 show direction of current ; A, beginning of circuit ; B, end of circuit; 



c, c, c, steps, 3 inches each, the floor between the steps being level ; d, 



d, d, outside walls ; /, partition- walls. 

 Plate XXX. Foster's fish- way, closed, (p. 613.) 



Plate XXXI. Common rectangular fish-way in operation, (p. 611.) 



Plate XXXII. Fig. 1. Brewer's first fish- way, (p. 606.) 

 Fig. 2. Brewer's second fish-way, (p. 607.) 



Plate XXXIII. Fig. 1. Call's straight fish- way, (p. 608.) 1. Plan : E, entrance for water ; 



O, outlet of water. 2. Section through A B. 



Fig. 2. Call's spiral fish-way, (pp. 608, 614.) The outlet is not represented, but 



may be made at any point by piercing the outer wall ; its precise 



location will be determined mainly by considerations of convenience. 



Plate XXXIV. Atkins's fish-way ; (p. 615,) This is a sx)iral arrangement of the common 

 rectangular fish-way, with very short compartments, devised in imi- 

 tation of Mr. Pike's invention. The fish are shown heading against 

 the current, which flows as indicated by the arrows. The windows 

 are mere apertures for the admission of light. In the plate, the 

 walls are represented as solid if built of joist and plank, there may 

 be an open space extending around the entire outer walls under- 

 neath each floor, which will facilitate the lighting and oversight of 

 the interior. 1. Plan: E, inlet for water; E', second inlet, to be 

 used when the river is too low to supply the fish-way through E . 

 2. Elevation. 



