70 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Table V. 



Specific iji-ailty of a 10 per rent, solution of com men fiuU at 10° K. (=12.5'-' C. =54.5'= F.) 



1. 1. 0738 Ch.aiuller iiud Wiechmauu. 



2. 1.0737 Chandler and Wiechmaun. 



3. 1.0741 Chandler and Wieclimann. 



4. 1.07303 Schiiber and Peeher (Din};l. Pol. .!., 1828, XXVII, 65). 



5. 1.07518 Schober and Peeher. 

 C. 1.07372 SchoUer and Peeher. 



7. 1.073464 Dr. Gerlach (Zeit. Anal. Chemie, 1865, IV, 8). 



8. 1.073405 Dr. Gerlach (Zeit. Aual. Chemie, 1865, IV, 8). 



9. 1. 073.50 Franeienr (M6nioire snr I'Areonietrie, Paris, 1842, 26). 



1.0737665 Average. 



Note. — 1 was chemically pure salt; 2 was Syracuse solar salt; 3 was Syracuse factory-filled dairy salt; 4 was 

 rock salt; 5 was chemically pure salt ; 6 was commercial salt. 



The average of these determinations gives as the specific gravity of a 10 per cent, salt solu- 

 tion 1.0737665, and the modulus is= 145.56289, computed according to the formula 



'H = 



P (d-1 0) 

 1-p 



in which P=the spec^iflc gravity, (l=the Baum6 degree, /( = the modulus. 



With tlie use of this modulus tlie following table (Table VI) has Vieen calculated by the formula 



(H-10)+f? 



in which P=the specific gravity, (/=the Ban me degree, »i=the modulus. 



Table VI. — Valut of degrees Bamne calculated from Oo=;i.0737665 and 10o=l hy the modulus 

 145.56289, the e.iperimental worl- harhiy been conducted in exact accordance with Baume''s original 

 directions. 



[Temperature 10° R.=12..5^ C=54..5'^^ F.] 



On comparing Table VI with Table II it will be seen that it agrees most closely with the first 

 scale, which is Francceur's, and which has been adoi)ted by the United States Petroleum Associa- 

 tion. 



CONCLUSION. 



In conclusion I would suggest to the Academy that, owing to the very extensive u.se which is 

 made of the Baum6 instruments, it would be eminently projier to consider the propriety of legis- 



