YOURS
FREE So you may try the finest... S&S FILTER PAPER SAMPLER To acquaint more chemists with the advantages of S&S Analytical Filter Papers, we invite you to mail the coupon for a free sampler made up of many grades. S&S Filter Papers are known for their consistent accuracy, physical uniformity, and a wide range of types from which to choose. If you demand only the finest working tools, send for your S&S Filter Paper Sampler. Make your own tests. Compare.
For retention values at a
glance...
S&S FILTRATION CHART Here is complete data on the relative retention values of S&S Analytical Filter Papers and other brands, in convenient form for ready laboratory reference. This easy-to-read, desk-size chart shows at a glance which filter paper grade to use for a given analysis. You'll want one of these valuable, timesaving S&S Filtration Charts. To get yours, just fill out the coupon below, and mail.
For the Bacteriologist and Chemist Here is a 4-page folder giving detailed information and instructions regarding the use of membrane filters, including technique for sterilization, filtration, and cultivation.
Carl Schleicher & Schuell Co.
The folder describes the new S&S "Bac-T-Flex"* flexible membrane filter, with the larger-sized green grid designed for easier and more accurate counting of bacteria colonies. Send for your free copy.
Name
D e p t . A - 6 4 , K e e n e , N e w Hampshire
Please send your free S&S •
• Filter Paper Sampler Filtration Chart • Membrane Filter Folder
Company A ddress City
State-
•"Bac-T-FIex" is a trademark
far further information, cireie numbers 49A-1, 49A-2, 49A-3 on Readers' Service Card, page 41 A
VOLUME
2 6, N O . 6, J U N E
1954
49 A
