138 Col, Beaufoys Astronomical Observations, [Aug. 



Article IX, 



Astronomical Observation Sy 1823. 

 By Col, Beaufoy, FRS. 



Bushejj/ Heath, near Stanmore, 

 Latitude 510 37/ 44.3^/ North. Longitude West in time 1' 20'93". 



July!. Solar eclipse Jj,^| j^^^^, ^y,, ^.^ Time. 



t)louds prevented the observation of the commencement ; but the ending was made under 

 very favourable circumstances. 



Article X. 

 Analyses of Books. 



1, The Elements oj Experimental Chemistry, By "William 

 Henry, MD. FRS. &c. &c. The Ninth Edition, comprehend- 

 ing all the recent Discoveries ; and illustrated with 10 Plates 

 by Lowry, and several Engravings on Wood. In Two Vo- 

 lumes. 1823. 



In noticing the present edition of Dr. Henry's Elements of 

 Chemistry, it is not my intention to enter minutely into a discus- 

 sion of its merits : it is a work which has been so long and justly 

 appreciated as to bid defiance to criticism, and render particular 

 commendation superfluous. It would, however, I think, be unjust 

 to the author and the public, not to depart a little from the usual 

 course in thus announcing anew edition of an established work, 

 on account of the improvements and numerous important addi- 

 tions with which it has been enriched. 



With true philosophical caution, Dr. Henry has net been hasty 

 in admitting more modern doctrines to displace those which 

 were not only by him, but by the chemical world in general, 

 received as true, until within a few years. In making this 

 remark, I allude to Sir H. Davy's views of the nature of chlorine ; 

 and if the late edition of Dr. Henry's work was in any respect 

 imperfect, it appeared to me to be in the uncertainty which per- 

 vaded it with respect to the nature of chlorine, and the conse- 

 c[uent difficulty which must have attended the learner in acquir- 

 ing settled opinions, when the teacher appeared undecided. 



In the present edition this indecision is removed, and although 

 the former opinion of the compound nature of chlorine may be 



