CONTENTS. Xcix 



APPENDIX D— Contiunecl. ''"'^' 



XXII. Papers relating to practicvl fish-culture 567 



A. Method of treating adhesive eggs of certain fishes, especially of the 



CyprinidiB, in artificial propagation. By Rudolph Hessel 567 



B. On the so-called "dry" method of impregnating spawn. By Alexander 



Stenzel, Inspector of fisheries in Silesia, Germauy 571 



C. Fish-cultnre in salt or brackish waters. By Theodore Lyman, Fish- 



commissioner of Massachusetts 575 



D. Descriptions of improved apparatus in fish-hatching 578 



1. Shad hatching or floating boxes , 573 



Seth Green's box 578 



* Braokett's box 579 



Stilwell and Atkins's box 579 



2. Tray -apparatus for hatching 580 



Holton's tray-hatchiug apparatus 580 



Clark's tray-hatching apparatus 582 



Williamson's hatching-box 585 



3. The brook-shanty 586 



E. Frog-culture, by Seth Green 587 



1. How to get the spawn 587 



2. How to take care of them 587 



APPENDIX E.— OBSTRUCTIONS TO THE UPWARD MOVEMENT OF 



FISHES IN STREAMS, AND THE REMEDY 589 



XXIII. On fish-ways. By Charles G. Atkins 591 



A. Introductory remarks 591 



B. Habits of migratory fishes 591 



C. The construction and location of fish-ways 594 



1. Situation 594 



2. Attractiveness 596 



3. Ease of ascent 601 



D. Devices which are in use or have been proposed 603 



1. Gap 604 



2. Trench or Cap6 Cod fish- way 604 



3. Oblique groove 605 



• 4. Step-fish- ways 606 



5. Smith's fish- way 607 



6. Call's fish-way 608 



7. Pike's fisL-way 609 



8. Steck's fish- way , 610 



9. luclined-plane fish-ways 610 



10. The Pennsylvania fish-ways 610 



11. The common rectangular fish-way 611 



12. Brackett's fisli-way 612 



13. Fish-ways with oblique partitions 613 



14. General arrangement 614 



E. Subsidiary considerations 615 



1 . Protection against floods 615 



2. Material and cost 615 



XXIV. On obstructions to the ascent of fish in certain rivers 617 



A. Obstructions in the rivers of Maine. By E, M. Stil well 617 



Saint Croix River 617 



Peumaquan River ., 617 



Dennys River 617 



