RECENT ADVANCES IN SCIENCE 361 



W. G., The Parallaxes of the B Stars which lie between the 

 limits of 4h. to 8h. R.A. and + 24 to + 32 Dec., M.N., R.A.S. 

 78, 651, 1918. 



MacMillan, W. D., On Stellar Evolution, Astroph. Journ. 



48, 35, 1918. 



Shapley, Harlow, Studies based on the Colours and Mag- 

 nitudes in Stellar Clusters ; 6th paper : On the Determination 

 of the Distances of Globular Clusters, Astroph. Journ. 48, 89, 

 1918. 



Lense, J., Kinetische Gastheorie und Fixsternsystem, Ast. 

 Nach. No. 4958. 



Tucker, R. H., The Visual Magnitude Scale and the Counts 

 of Stars, Lick Obs. Bull. No. 312, 191 8. 



Miscellaneous. — Sampson, R. A., On*" the Measurement of 

 Time to the Thousandth of a Second, M.N., R.A.S. 78, 592, 

 1918. 



Sanford, F., The " Astronomical Atom " and the Spectral 

 Series of Hydrogen, Astroph. Journ. 48, 1, 191 8. 



King, A. S., The Variation with Temperature of the Electric 

 Furnace Spectra of Ca, Sr, Ba and Mg, Astroph. Journ. 48, 

 13, 1918. 



Haussmann, A., Uber die Ausbreitung einer ebenen Licht- 

 welle in einen Medium mit Kontinuierlich variablem Brech- 

 ungsindex, Ast. Nach. No. 4953, i9 l8 - 



Maunder, Mrs. A. S. D., The Date and Place of Writing 

 of the Slavonic Book of Enoch, Observatory, 41, 309, 191 8. 



The following volume contains much valuable information 

 and the chief contents are therefore summarised : — 



Publications of the Astronomical Observatory of the University 

 of Michigan, vol. ii. 191 6. 



(1) Studies of Class B stellar spectra containing emission 



lines. 



(a) The spectrum of y Cassiopeiae. 



(b) Changes in the spectrum of f 1 Cygni. 



(c) Changes in the spectrum of H.R. 985. 



(2) Spectroscopic observations of stars of class Md. 



(3) A spectrum of the P Cygni type. 



(4) The spectrum of £ Ursae Majoris. 

 24 



