788 LIST OF ILLUSTRATIONS. 



Plate XVIII. Fig. 2. Plao-viow of box. 



Fig. 3. Plan-view of gaugc-screeus. 



Fig. 4. Perspective vievr of shallow pau ; coutaiuiug gauze-screen while depos- 

 iting the eggs. 



Fig. 5. Skeleton of hatching-basket. 



Fig. 6. Hatching-basket plaited or wattled with juniper-boughs. 

 Plate XIX. Illustrations to accompany paper by Theodore Lyman on fish-culture in 

 braokish waters, (p. 575.) 



Fig. 1. Outer side of dam; a, flowagecut ; h, waste-way. 



Fig. 2. Section of the dam at the waste-way ; c, inner screen protecting outer 

 screens from driftwood and logs ; d, second screen with finer grat- 

 ing ; e, central screen, with grating, as in Fig 4, to stop the fish ; /, 

 seaward screen to protect from action of waves and floating mate- 

 rials. 



Fig. 3. Plan-view of waste- way of dam ; letters same as in Fig. 2. 



Fig. 4. Grating, e, of vertical rods and horizontal wires, fail size. 



Fig. 5. Inner side of dam j A B, natural level of brook at low tide ; C D, level 

 of pond at low tide after dam is built; E P, level of pond at high 

 tide, both before and after dam is built ; a, bed of brook, outlet 

 open ; b, waste-way. 



Fig. G. Longitudinal section of pond ; C D, level of pond at low tide after 

 dam is built ; E F, level of pond at high tide, both before and after 

 dam is built ; E, fresh water supplied from brook G; F, salt-water 

 supplied from sea. 

 Plate XX. Fish-ways in the Columbia dam, Susquehanna River, Pennsylvania, (pp. 

 GOO, 601, 604, and 610 ;) scale, 24 feet to an inch ; intended mainly for 

 the passage of shad. 



Fig. 1. Fish-way of 1873 ; plan in outline. 



Fig. 2. Fish-way of 1S73 ; profile through A B of Fig. 1. 



Fig. 3. Fish-way of 1866 ; plan in outline. 



Fig. 4. Profile through C D, Fig. 3. 

 Plate XXI, Inclined-plane fish-ways, (pp. 604 and 610.) The arrows show the direc- 

 tion of the current. 



Fig. 1. The Swazey plan, invented by Alfred Swazey, of Bucksport, Me., (p. 614.) 



Fig. 2. The same, with additions by C. G. Atkins, (p. 614.) 



Fig. 3. The Foster plan. 



Fig. 4. The same modified, as built on Penmaquan River, (p. 613.) 



Fig. 5. From a design for a fish- way on Androscoggin River, August, 1870. 



Fig. 6. The Brackctt plan; patented by E. A. Brackett, of Massachusetts. 

 Plate XXIL Plans offish-ways, (pp. 605, 607, 610, 612.) 



Fig. 1. Smith's fish-way; invented by James Smith, of Deanstono, Scotland, 

 1840, (p. G07.) 



Fig. 2. Steck's fish-waj'; invented by Daniel Steck, of Pennsylvania, (p. 610.) 



Fig. 3. A recent device, not tested : the slanting boards will probably assist 

 alev7ives. 



Fig. 4. The pool fish-way, (p. 606.) 



Fig. 5. E.A. Brackett's improvement in fish-ways; patented October 22, 1872, 

 No. 132349. 1, a vertical section : A, location of dam ; B, the trough 

 or chute inclosing way; d, abutments or partial bulk-heads in chute ; 

 e,f, bends or wings extending at right angles with bends or bulk- 

 heads. 2, side-elevation : 6^, lowest water-inlet or supply-port in 

 chute ; c, gate for closing inlet-port ; A and B, same as in 1. 3, A, B, 

 h", c, d, e, and /, same as in 1 and 2 ; a, discharge-port at lower end ; 

 1), ¥, additional inlet-ports, (p. 612.) 

 Plate XXIII. Plan of Brackett's fish- way at South Hadley Falls, Mass., (p. 612.) 



