iiistorij cf Astronomy for the Year 180C. 1£T 



observations, which have no connection with his ideas. la 

 the Journal des Mines, no. 108. vol. xviii. pages 321 to 377* 

 they have published observations upon the barometer and 

 upon the heights of mountains, made with incredible labouf 

 by this intrepid traveller. This interesting collection for ge- 

 ology and and meteorology forms a continuation to those 

 of sir G. Shuckhurgh in the Philosophical Transactions for 

 1777 : it is much to be wished that these examples may be 

 imitated. 



M. Andre, in his Geology of the Mountains he has vi- 

 sited, ascertains every where that the water once flowed 

 over these mountains. He does not endeavour to explain 

 their retreats ; but 1 think I have proved that they are in 

 subterraneous cavities which are under the superficial crust 

 upon which we live. Journal de Paris, Nov. 8, 1805; 

 Jovrnal des Debals, May 7, 1S05. 



Noe Andre was born in 1728; he became a capui.':ln in 

 i 745. In 1770 he proposed to undertake a chart of Frauche- 

 Comle ; but, having come to Paris by chance in 1773, hG 

 was kindly received by M. Le Monnier, who lodged in the 

 court of the Capuchins : he made some celestial planispheres 

 in 1778 and 1780. In 1731 he set out on his travels, which 

 he prosecuted fur six years, at the rate of six months each 

 year. These travels have produced a most valuable col- 

 lection of observations from the pen of M. Andre. 



M. de Lezenne, professor at Lisle, has printed an ele- 

 niei:itary Giiuynonique in 26 pages, which will be very useful 

 to bind up with those astronomical works in which this ap- 

 plication is not sufficiently given in detail. I gave in 1761 

 a more extensive and complete Gnomonique in Jie Encf/do- 

 pedie Mef/iodicjice, at the word Dial, vol. i. article Matiie- 

 matics. It was intended to introduce it into the fourth vo- 

 lume of my Astronomy, which appeared in 1781; but the 

 abundance of matter in which I have been engaged hinder- 

 ing me from publishing it, it has not hitherto been printed 

 separately, which has limited its usefulness : we there find 

 tourtecn species of dials, several of which are not to be 

 found in other treatises, except that of don Bcdos, 1778, in 



