48 FISHERIES OF THE UNITED STATES. 



GLOUCESTER ISINGLASS & GLUE COMPANY, Gloucester, Massachusetts: 

 Exhibit of Liquid Isinglass, etc. — Continued. 



No. 36. Guano from Halibut heads, after the oil has been removed. Accord- 

 ing to an analysis by S. P. Sharpies, United States assayer, this 



guano contains : 



Per cent. 



Phosphoric acid 12. 89 



Equal to bone phosphate 27. 14 



Nitrogen 5. 29 



Equal to ammonia 6. 42 



Moisture 5. 11 



No. 37. Guano from fresh fish heads after the glue has been removed. Ac- 

 cording to an analysis by S. P. Sharpies, United States assayer, 



this guano contains : 



Per cent. 



Phosphoric acid 20. 22 



Equal to bone phosphate 44. 14 



Nitrogen 6. 52 



Equal to ammonia '. 7.91 



Moisture 3. 48 



No. 38. Fishes eye-balls after the heads have been boiled. 



No. 39. Sample of frozen fish glue. 



"The utilizing of fish waste or skins was first discovered by the pat- 

 entee, John S. Rogers, of Gloucester, Massachusetts, U. S. A., in 

 the fall of 1873. Having tried a number of loads for fertilizing 

 purposes, he found that it was very hard material to make into a 

 fertilizer, as it was very highly salted, and the skins would not 

 work up nor the bones dissolve. The Gloucester Isinglass and Glue 

 Company have a process for making all the bone and skin into 

 guano, that has a market value of $30 per ton. Having noticed 

 a gummy or sticky substance in handling what skins he tried for 

 fertilizing purposes, Mr. Rogers was led to think that isinglass or 

 glue could be made from them, and offered some of the fish mer- 

 chants five cents per barrel to keep the skins by themselves. From 

 these skins he experimented and finally made samples of glue 

 from fish skins, such as are shown at this exhibition, only on a 

 very small scale. At this time parties in the boneless fish busi- 

 ness did not know what to do with their fish waste and skins 

 taken from the fish in preparing their goods for market, and 

 would pay from 25 to 50 cents per ton to have them removed from 

 their buildings. Now they very often see what they can get for 

 their skins before they make a price for the fish in filling orders. 

 The preceding descriptive account of the different articles ex- 

 hibited by the Gloucester Isinglass and Glue Company shows the 

 results obtained by the process, starting from the raw material." — 

 (John S. Rogers.) 



MONROE A. GREEN, Mumford, Monroe County, New York: 



Samples of barbless books, made by Mr. Green for Trout and Bass 



fishing. (IS.) 

 Box for the transportation of fish ova. (35.) 



SETH GREEN, Rochester, New York: 

 • Hybrid between California Salmon and Brook Trout ; hybrid be- 

 tween Salmon Trout and Brook Trout. (36.) 

 Floating box for use in open stream. (35.) 



