32 AMERICAN FISHERIES SOCIETY. 



already succeeded in profitably competing with Scotland in sup- 

 plying the London market with fresh herring thus prepared. A 

 more complete preservation of herring, so that they will keep in 

 good order for a longtime, is obtained by the Sahlstrom process 

 and by the Roosen method by which a solution of boracic acid 

 and salt is thoroughly impregnated into the flesh, under a pres- 

 sure of 60 to loolbs. to the square inch. Successful experiments 

 have been made in Scotland in treating fresh sal'*ion by the 

 Roosen process. Three hundred pounds of fish were packed in 

 a strong steel barrel, and with a pressure pump the solution was 

 forced into the salmon until they were thoroughly impregnated. 

 After three weeks subjection to this process the fish were cooked 

 and found of excellent flavor. Strongly made wooden barrels 

 may be substituted for steel barrels, or, after being treated under 

 pressure, the fish may be repacked with the solution in common 

 fish barrels. 



4. Eckhart's Method. — By this process, devised by John Eck- 

 hart, of Munich, and patented in i88o-'82, fish are prepared in a 

 preserving salt consisting of a mixture of 50 per cent, common 

 salt, 47 >^ per cent, chemically pure boracic acid, 2 per cent, tar- 

 taric acid, and ]4. per cent, salicylic acid. The fish are first strip- 

 ped of skin and bones, and the flesh is mixed with the preservative 

 in the proportion of 20 grams of the mixture to one kilogram of 

 fish flesh. They are then packed in cases of parchment or other 

 material and put into casks which are filled with a gelatine solu- 

 .tion made in the proportion of 50 grams of gelatine, 20 grams 

 of the preservative, and 1,000 grams of water. The casks are 

 then headed and connected with a force pump and more of the 

 solution is forced in until the contents are well saturated. The 

 sacks or cases of fish are then removed from the cask, and mav 

 bestrewn over with more of the salt in dry condition and packed 

 for shipment, or they may be shiped in casks with the liquid. 



5. Boracic and Acetic Acids. — By the Am Ende process, boracic 

 acid either in a liquid or pulverous state, is compounded with 

 acetic acid in the proportion of about one drop of acetic to every 

 ounce of boracic acid, and the compound is applied in the usual 

 manner. The acetic acid is said to prevent the formation of fungi. 



