SCIENCE 



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New Series 

 Vol. LII, Mo. 1339 



Friday, August 27, h 





Single Copies, 15 Cts. 

 Annual Subscription, 86.00 



Some of Our Spt% >lties 



American Rotary Vacuum Pumps. 



Practical Apparatus for Producing Vacuums 

 down to 0.00001 mm. and MacLeod Vacuum 

 Gauge, Columbia University Modification, 

 for determining accurately the degree of 

 vacuum. 



Bailey Walker Extraction Appa- 

 ratus. 



Especially popular vi^ith the Agricultural 

 Colleges. 



Beu-nstead Water Stills. 



Bausch and Lomb Microscopes. 



Bingheun and Green Variable Pres- 

 sure Viscometer and Plasto- 

 meter. 



Braun, Crushers, Grinders and 

 Pulverizers. 



Coors Porcelain Ware. 



DuBosc Colorimeter, E & A Im- 

 proved. 



E & A Tested Purity Chemical 

 Reagents. 



The Best Selection from the Products of the 

 Best Factories. 



E & A Universal Carboy Inclina- 



tor. 

 E & A Universal Laboratory 



Motor. 

 Spencer Microscopes. 



Fleming and i . Absorption 

 Bulbs. 



For Determining Carbon in Steel, Etc. 



Freas Regular and High Tempera- 

 ture Electric Ovens. 



Freas Baking, Conditioning and 

 Vacuum Ovens. 



Freeis Water Baths, Thermostats, 

 and Tube Furnaces. 



Gramercy Reagent Bottles. 



Gramercy Stirrers. 



Hevi-Duty Replaceable Unit Elec- 

 tric Furnaces. 



For Temperatures up to 1100° C. 



Hortvet Cryoscope. 



Juerst Ebullioscope. 



MacMichael Viscosimeter. 



Multiple Replaceable Unit Electric 

 Furnaces and Hot Plates. 



Parsons Gas Generator. 



Pickel Extraction Apparatus. 



Pyrex Glassware. 



Emulsifier, U. S. Navy, E & A, 

 Improved. 



Wysor Polishing and Grinding Ap- 

 paratus, Etc. 



Write for Descriptive Bulletins and Additional Information. Visit 

 our Booth No. 5 8 at the Sixth National Chemical Elxposition, also our 

 New Showroom at 209 Third Avenue. 



Headquarters for Industrial and Educational Laboratory Supplies 



AND 



jnETiS 



PITTSBURGH BRANCH 

 2011 Jacluon Arcade 



