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 

 Thymol Blue (acid range) 

 Methyl Orange 

 Bromphenol Blue 

 Resorcin Blue 

 Methyl Red 

 Bromcresol Purple 

 Litmus (special) 

 Bromthymol Blue 

 Phenol- Red 

 Cresol Red 



Thymol Blue (alkaline range) 

 Cresol-phthalein 

 Phenol-phthalein 



Section 2-B. — Specially prepared and 



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, 2HiO 



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. 



''Standards Department" 

 13 W. Saratoga St. Baltimore, Md. 



Summarized Proceedings and Membership List 



OF THE 



AMERICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE 



This volume contains the constitution of the Association, and the summar- 

 ized reports of seven annual meetings — from 1914 to 1920— with lists of 

 officers, etc., for each of the years, together with references to Science for 

 presidential and vice-presidential addresses and other ofl&cial communications 

 for those years. 



The Membership List, contained in the volume, forms one of the most 

 useful directories of its kind, as an address list of American scientific 

 workers and friends of science. The list, corrected to June 15, 1921, con- 

 tains about 12,000 names and addresses, together with specific scientific, 

 professional, or industrial connections. It constitutes an invaluable reference 

 volume at a very low cost. 



This volume may be purchased from the office of the Permanent Secretary 

 of the Association, in the Smithsonian Institution, Washington, D. C; or 

 from the Williams & Wilkins Company, Mt. Royal and Guilford Aves., 

 Baltimore, Md. 



Price: $2.00 to members of the Association, vS2.50 to non-members, payable 

 when the order is placed. Prices are net, postpaid. 



