GASTRON 



AT THE THRESHOLD 



To gastric juice Nature assigns the role of a powerful antiseptic. 



GASTRON, an extract of the actual tissue juice of the entire stomach 

 mucosa, contains all the soluble, the activable constituents of the gas- 

 tric juice itself in a carminative agreeable solution with 0.25 per cent 

 hydrochloric acid, organically bound. 



At the threshold of the digestive tract Gastron may be utilized as a 

 physiological recourse against fermentative dyspepsia, to supplement 

 and fortify impaired digestion. 



Gastron is alcohol free. 



Fairchild Bros. & Foster 

 NEW YORK 



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 



Creeol Red yellow-red 7.2-8.8 



Thymol Blue (alkaline range) yellow-blue 8.0-0.6 



Cresol-phthalein colorless-red 8.2-9.8 



Phenol-phthalein colorless-red 8.4-0.2 



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 (COi free) 



Potassium Chloride Hydrochloric Acid Di-Sodium Phosphate, 2HtO 



A large number of general sj r nthetic and purified compounds are manufactured by 

 us and information concerning them may be obtained by addressing 



LA MOTTE CHEMICAL PRODUCTS CO. 



"Standards Department" 

 13 W. Saratoga St. Baltimore, Md. 



