LaMotte Standards 



GUARANTEED 



Section 1. — Standardized Indicator dyes. Covering a wide range of H-ion con- 

 centration. Supplied in dry form and in sterile stock solutions. Each indicator 

 is standardized in strict accordance with the specifications of Clark & Lubs. (Jr. 

 Bact., Vol, II, Nos. 1, 2, 3, 1917.) 



Common Name Color Change Ph Value 



Thymol Blue (acid range) red-yellow 1.2-2.8 



Methyl Orange red-yellow 2.9-4.0 



Bromphenol Blue yellow-blue 3.0-4.6 



Resorcin Blue pink-blue 4.0-7.2 



Methyl Red red-yellow 4.4-6.0 



Bromcresol Purple yellow-purple 5.2-6.8 



Litmus (special) red-blue , 5.5-8.9 



Bromthymol Blue yellow-blue 6.0-7.6 



Phenol-Red yellow-red 6.8-8.4 



Cresol Red yellow-red 7.2-8.8 



Thymol Blue (alkaline range) yellow-blue 8.0-9.6 



Cresol-phthalein colorless-red 8.2-9.8 



Phenol-phthalein colorless-red 8.4-9.2 



Section 2-B. — Specially prepared and standardized Buffer salts and solutions. 

 Buffer mixtures may be obtained in series covering any particular range of H-ion 

 concentration from Ph 1.0 to 10.0. 



Standardized Buffer Solutions (M/5) 



Potassium Phosphate Potassium Phthalate Sodium Hydroxide (CO2 free) 



Potassium Chloride Hydrochloric Acid Di-Sodium Phosphate, 2H2O 



A large number of general synthetic and purified compounds are manufactured by 

 us and information concerning them may be obtained by addressing 



LA MOTTE CHEMICAL PRODUCTS CO. 



*'Staiidards Department*' 



13 W. Saratoga St. Baltimore, Md. 



GENETICS 



A Periodical Record of Investigations Rearing on 

 Heredity and Investigation 



ISSUED BIMONTHLY 



EDITORIAL BOARD 



George H. Shull, Mp.naging Editor 

 Princeton University 

 William E. Castle Edwin G. Conklin Charles B. Davenport Bradlet M. Davis 



Harvard University Princeton University Carnegie Institution of Washington University of Michigan 

 Edward M East Rollins A. Emerson Herbert S. Jennings 



Harvard University Cornell University Johns Hopkins University 



Thomas H. Morgan Raymond Pearl 



Columbia University Johns Hopkins University 



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