158 



26 d O h 41™ IV. Sh. E. ; 27 d 2 h 12 m 48' III. Ec. D 

 34™ II. Sh. I. 



KNOWLEDGE 

 29" 3' 



May 1915. 



Saturn is invisible, being in conjunction with the Sun on 

 28th. 



U ran us is a morning star, but badly placed. 



Neptune is an evening star in Cancer; diameter 2". 



Double Stars and Clusters. — The tables of these, 

 given three years ago, are again available, and readers are 

 referred to the corresponding month of three years ago. 



Variable Stars. — Stars reaching their maxima in or near 



June, 1915, are included. The lists in recent months may 

 also be consulted (see Table 28). 



Meteor Showers (from Mr. Denning's List) :— 



Table 27. Occultations of Stars by the Moon visible at Greenwich. 



From New to Full disappearances occur at the Dark Limb, from Full to New reappearances. 

 Table 28. Long-period Variable Stars. 



Night Minima of Algol 10 d 3 h -8m, 13 d h '6»», 15 d 9 h -4c, 30 d 5 h -5 m. Period 2 d 20 h 48 n -9. 

 Principal Minima of (3 Lyrae 13 d 3 h m, 26 d l h m. Period 12 d 21 h 47 m -5. 



REVIEWS. 



CHEMISTRY. 



Quantitative Organic Analysis. — By P. C. R. Kingscott, 



B.Sc, A.I.C., and R. S. G. Knight, B.Sc, A.I.C. 



283 pages. 51 figures. 8£-in. x 5J-in. 



(Longmans, Green & Co. Price 6/6 net.) 



The analysis of organic compounds does not admit of 

 that degree of systematisation which has been found possible 

 in the case of inorganic compounds. Group reagents can 

 only be used to a limited extent for the separation of carbon 



compounds into separate classes ; and, in examining an 

 unknown compound, it is necessary to determine its 

 elementary composition, molecular weight, and physical 

 properties, as well as to ascertain the presence of distinctive 

 groups of atoms within its molecule. The object of this 

 book has been to give a concise, workable description of 

 all the methods commonly employed ; and, since many of 

 the processes for the estimation of special radicles are not 

 readily accessible, the authors have done a serviceable 

 work in bringing them together in a convenient form. The 



