574 
Proceedings of the Royal Society 
Locus corrig. 
Error. 
Correct. 
Locus corrig. 
Error. 
Correct. 
Log. 98 338 
3 
4 
Log. 98 772 
8 
7 
98 339 
6 
7 
98 936 
7 
8 
98 340 
39 
40 
98 966 
4 
3 
98 341 
1 
2 
99 926 
2 
1 
98 342 
3 
4 
100 330 
3 
2 
98 345 
6 
7 
98 346 
6 
7 
Wolframii tabula Logarithmorum 
98 348 
5 
6 
naturalium. 
98 350 
98 352 
98 353 
2 
7 
4 
3 
8 
5 
Log. 1 099 
7 853 
1 0021 1 
9676 
| 0021 5 
1 9686 
98 356 
2 
3 
98 357 
7 
8 
98 358 
2 
3 
Magnus Canon Logarithmorum 
98 359 
6 
7 
vulgarium trigonometricus. 
98 360 
0 
2 
Log.tan. 0° 30' 45" 
1 101 
I 201 
98 362 
6 
7 
Cotg. 0° 30' 45" 
] 899 j 
799 
98 365 
2 
3 
98 366 
3 
4 
Alias maculae posterius signa- 
98 367 
4 
5 
buntur. 
Paris, le 29 mars 1875. 
F. Lefort. 
Translation. 
1. Observations relative to Mr Edward Sang’s “ Remarks on 
the Great Logarithmic and Trigonometrical Tables calculated 
in the Bureau du Cadastre under the direction of Prony,” 
published in the Proceedings of the Eoyal Society of Edin- 
burgh, Session 1874-1875, by M. E. Lefort, Inspecteur 
General des Ponts et Chaussees, Corresponding Member 
of the Academy of Sciences of Naples. 
Mr Edward Sang, in the above cited article, makes most flatter- 
ing mention of the works which I have published on the subject 
of Logarithms, and particularly on the great operations performed 
in the end of the last century under the direction of Prony. I 
cannot but thank him, yet without wishing to intervene in any 
way in the controversy between him and the editor of the scientific 
periodical “ Nature.” But I owe it to him, as well as to the 
honourable Koyal Society of Edinburgh, to give explanations on 
