Scienij/lc Intelligence. '^New Publications, 405 



Henderson of Edinburgh, for another correction still, nfundy, 

 that arising from the ejfiPect on the horizontal parallax of the 

 moon, caused by the oblate figure of the earth. We recommend 

 Mr Galbraith, in his next edition, to bring all tSiese corrections 

 distinctly under the reader's view at one place. 



Our author does not eonfine himself, however, to the pro- - 

 blems in ordmary use, &uch as lunar observations, occultations * 

 of the fixed stars, chronometrical observations, and the measure- 

 ment of heights by the barometer, which last is admirably exe- 

 cuted, but enters also with the full spirit of an observer, and 

 all the minute accuracy of a computer, into the elegant disquisi- 

 tions dependent upon the figure of the earth, the velocity of 

 sound, and other topics of high interest. 



We shall now pixxjeed to point out briefly those improvements 

 and additions which we have been most struck with in the 

 tables. 



In Table II, of the common logarithms, there are added pro- 

 portional parts, which greatly facilitate its use. 



Table V. or logarithmic tangents, &c. has two sets of argu- 

 ments, one for time, and one for arc, besides proportional parts 

 for seconds at the bottom. 



We are decidedly of opinion, however, that, for most practi- 

 cal purposes, it is infinitely better to have separate tables for 

 converting time into arc, and the reverse ; and we have reason 

 to believe, accordingly, that Mr Galbraith stopped the press to 

 give tables LXI. and LXII. at our suggestion. In the next 

 edition we hope he will place these two tables by the side of 

 XXX. and XXXI., for converting solar into siderial time, and 

 the reverse, and near XXXII. for converting mean time into 

 parts of the equator. These are all eminently useful ; and we 

 are glad to observe Mr Galbraith giving them at full length, to 

 single seconds, and not in the usual abbreviated shape, which is 

 very teazing. 



Tables VI. and VII., for natural sines, tangents, &c. are too 

 contracted, being given to degrees only ; if given at all they should 

 be to minutes. 



Table IX., for taking out the proportional parts for daily dif- 

 ferences of declination, right ascension, &c. we do not much like; 

 as it requires the use of the proportional logarithms in die next 



JANUARY MARCH 1827. D ^ 



