210 Mr. Utting’s Errata in Mathematical Tables. 
and south haye very nearly the same form. Those of the ob- 
servations which there has not yet been time to discuss, belong 
to questions not less curious. It results, for example, from the 
operations of M. Freycinet, that there exists at the Isle of 
France a cause of local attraction so intense as to alter the 
rate of a clock there 13 or 14 seconds aday. It may be con- 
ceived how interesting it becomes to investigate, in the obser- 
vations of M. Duperrey, if the accidental influence was also 
manifest.—In a few days the results of this inquiry will be 
presented to the Academy. 
[To be continued.] 
XXXIII. List of Errata in the Mathematical Tables of Dr. 
Horton and Dr.Grecory. By Mr. J. Urine. 
To the Editor of the Philosophical Magazine and Journal. 
Sir, 
Bs ee it is very desirable to obtain the greatest accuracy in 
mathematical tables, the following list of errata, which I 
have discovered in Dr. Hutton’s and Dr. Gregory’s tables, 
will I trust be acceptable to such gentlemen as use the tables 
in which the following list of errors are pointed out. 
In Dr. Hutton’s Mathematical, &c. Dictionary, first edition: 
Square roots of numbers to ten places of decimals. 
Nos. 138 for 11. 43808 read 11. 01245 
149 — 12, 3 — 12. f 
197 — 14. 41 — 14. 76 
374 — 19. 537514 — 19. 796058 
462 — 21. 579 — 21. 602 
482 — 21. 24 — 21. 01 
499 — 22, 9 — 22. 7b 
504 — 22. 1206. —* 22. ~ 3206 
580 — 24. 683962 — 24. 891576 
586 — 24. 6 — 24. 8 
634 — 25. Ol — 25. 40 
706 — 26.4 — 26.5 
712 — 26. 3 — 26. 2 
788 — 28. 881 — 28. 952 
879 — 29. 24743 — 29. 41607 
952 — 30. i=! 30. 1 
For Dr. Hutton’s tables of the product and powers of numbers: 
Table of products. 
No. 15 by 277, for 5155 read 4155. 
In 
