THE WORLD'S COLUMBIAN EXPOSITION. 187 



14. Rearing Apparatus. 



Clark's trout-rearing troughs : WMteflsh tanks. Shad tanks. 



(a) Accessories: Ainsworth's spawning race. Mather's spawning cone. 



Spawning pans. Spawning buckets. Page's egg scale. Egg fun- 

 nels for whitefish and shad. Series of nets from Central station, 

 Washington, D. C. Series of nets from Northville station, Mich. 

 Series of nets from Battery station, Md. Nippers, brass and wood. 

 Dippers. Strainer dippers. Hume's spawning box. Rubber boots. 

 Oil clothing. Pan for washing eggs. Salmon dip net. Tray for 

 washing eggs. Siphon bags. Siphon cages. Siphon tubes. Aquaria. 



(b) Accessories to pond culture: Seines. Dip nets. Farm profit boiler. 



Meat chopper. Gun. Garden rake. 



15. Hatching and Rearing Establishments. 



Charts : 



(a) Chart giving names and location of stations and output of each station 



for fiscal year 1891-92. 



(b) Chart showing work of the Commission from 1872 to 1892. 

 Models of hatching establishments : 



(a) Hatching houses : Put-in-Bay hatchery. Leadville hatchery. Havre de 

 Grace hatchery. Gloucester, Mass., hatchery. 



(6) Floating hatchery. Hatching barge. 

 Illustrations of hatching stations (showing buildings, exterior and interior, meth- 

 ods employed in collecting, hatching, rearing, and distributing iish 

 fry and eggs) : 



(a) Green Lake. Grand Lake stream. Bucksport and Craig Brook, Me. 



Gloucester cod station and Woods Hole, Mass. Central station and 

 Fish Commission fish ponds, Washington, D. C. Battery station, 

 Havre de Grace, Md. Bryan Point shad station, Md. Wytheville 

 station, Va. Duluth station, Minn. Alpena and Northville stations, 

 Mich. Put-in-Bay station, Ohio. The Quincy (111.) station. Neosho 

 station, Mo. Leadville station, Colo. Fort Gaston, McCloud, and 

 Baird stations, Cal. Clackamas, Oreg. 



(b) Floating stations : Hatching barge. Steamer Fish Hawk. 



16. Methods and Results of Fish Culture. 



Lay figures: Group illustrating shad fishing and spawning. fJroup illustrating 



cod fishing and spawning. 

 Chart showing the effect of fish-culture on the shad fishery. 

 Painted casts of fishes reared by the Fish Commission : 



(a) Brook trout, 1, 2, 3, and 4 years old. Von Behr trout, 1, 2, 3, and 5 years 



old. Loch Leven trout, 1, 2, 3, and 6 years old. Lake trout, 1 and 2 

 years old. Landlocked salmon, 1 year old. Rainbow trout, 1 and 

 2 years old. Whitefish, 5 years old. Carp, tench, goldfish, black 

 bass, etc. 



(b) Alcoholic and brine specimens: Eggs in different stages. Fry, yearlings 



and adults. 



Protection of Fish (assistance in ascending streams) : 



Duncannon fishway. Shaw's spiral fishway. Swazey's oblique fishway, old 

 style. Swazey's oblique fishway, new style. Worrall's expanding 

 sluice fishway. Worrall's chute fishway. Brewer's single-groove 

 fishway. Brewer's double-groove fishway. Steele's fishway. Smith's 

 inclined-plane return fishway. Lawrence fishway. Holyoke fish- 

 way. Everleth's self-adjusting fishway. Pike's spiral fishway. 

 Atkins's spiral fishway. Bangor fishway. McDonald fishway, old 

 style. McDonald fishway, section 6, Great Falls, Potomac River. 



Illustrations: Photographs: McDonald's fishway, Fredericksburg, Va. 



