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

 centration. Supplied in dry form and in sterile atock solutionR. Each indicator 

 is standardized in strict accordance with the specifications f>f Clark fi Liihs. (Jr. 

 lUct., Vol. II, Noa. 1,2, 3, 1917. 



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

 liuffer mixtures may be obtained in series covering any particular range of Il-ion 

 concentration from Pu 1.0 to 10.0. 



Standardized Buffer Solutions (M/5) 



PotAMium Phoaphate Potaaaium Phthalate Sodium Hydroxide (COi in*) 



PoUaaiuro Chloride Hydrochloric Acid Di-6odium Phosphate, 2HiO 



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