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The Study of Stellar Evolution: A Popular Account of Some Modern Methods 
of Astro: physical Bee cern ae ou Georce E. Hate 
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General Catalogue at Double Stars AeA a illustrations) By SuERBUENE W. BurnHamu 
328 pages et $4.00, postpaid $4.32 
Measures of Double a Made wits ‘iis “Forty-Inch Refractor of the Yerkes : 
Observatory in 1 te Eg I yy SHERBURNE W. BURNHAM 
way 4to; paper; “net $x. 00, pos c postpaid $1.05 
- Micrometrical atcnig conan of ok Made with the Forty-Inch Refractor of the Yerkes 
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4 
4 
" Astronomical Photography with the Forty-Inc an Two-Foot 
Reflector of the Yerkes Obeervatnsy By ¢ GEORGE ik Rircuey 
With 29 plates. 12. pages, ato, sawiag net 75 oon postpaid 80 cents, 
‘Radial Velocities of Twenty Stars Having oe Type 
 B: Frost is WaLTER s ApaMs” 
‘ith 3 plates: 108 pages, 4to, ees eae pee postpaid $z 
On the gwar of eee Stars of Secchi’s Fourth Type 
By Grorce E. Hate, FERDINAND ELLERMAN, at and or A. Paasnunst 
With rr plates. 136 pares ato, paper; net $2.00, 
The Rumford Spectroheliograp hh of a Yerkes Obearva 
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: With 26 sah a5 : 4 
“The eae of th ° High Poeun Discharge con Metallic E 
Liquids and eee of High Pressur _ By GEORGE E. Hare and Monzox hy. Kext 
23 plates. 66 pages, 4 : 
: “GEOLOGY 
2 American Permian Vertebrate ay SaMorL | Wanoet Winustox, 
‘Ig2 pages. vol 9 plates, 8vo, cloth; net $2 tetas 
Outlines of Geologic History with eer erence to North America: A 
: Series of s Invol i: of piletion. Ed = 
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OLLIN: D. Satur 
