1228 FISHERIES OF THE UNITED STATES. [74] 



e. MAPS SHOWING TOPOGRAPHY OF GROUNDS ADJACENT TO FISH- 

 CULTURAL ESTABLISHMENTS. 



SCHOODIC SALMON-BREEDING STATION. 



Plan No. 2, showing hatching-park, fishing-grounds, and principal 

 buildings. Scale, 1 inch = 60 feet. 



SCHOODIC SALMON BREEDING STATION. 



Plan 4, embracing plan of hatchery No. 3. Scale, 1 inch = 2 feet. 



Penobscot salmon-breeding station. 



Hatchery and watchman's room, plan and elevation. Scale, 1 inch 

 = 2 feet. 



Penobscot salmon-breeding station. 



Plan of inclosare for parent' salmon. Scale, 1 inch = 50 feet. 



Carp ponds at Washington, D. C. 



Plan of west and north pond ; gives elevation, bench-marks, and 

 areas. Surveyed by C. Junken, September, 1882. Scale, 1 

 inch = 30 feet. 



Great Falls, Maryland side, Potomac River. 



Survey by Eugene Ellicott, November 25, 1882, to January 10, 1883, 

 for U. S. Fish Commission. Scale, 1 inch = 50 feet. 



Saint Jerome Creek. 



West shore of Chesapeake Bay, Point Lookout to Point No Point; 

 surveyed between 1848 and 1856 ; copied from U. S. Coast and 

 Geodetic Survey Office for U. S. Fish Commission January 4, 

 1882. Scale, aoioo- 



McCloud River trout pounds. 



General plan of ponds, buildings, &c, with dimensions. Scale, 1 

 inch = 30 feet. 



accessories to hatching apparatus. 



Ainsworth's spawning-race. 



Model of natural spawning-race, invented by Stephen H. Ains- 

 worth, West Bloomfielcl, N. Y. Not patented. This device 

 consists of two sets of frames, covered with wire cloth, placed 

 in two layers ; the upper one has meshes coarse enough to al- 

 low the eggs to pass through, and is covered with coarse gravel, 

 in which the fish make nests and spawn. The upper screens 

 are then lifted and the ova taken from the lower ones. 42,936. 

 Gift of S. H. Ainsworth. 



