You can depend on Amersham/ Searle...for product or service... We weren't in business under the Amersham/Searle name when Werner Heisenberg said Δ ρ · Δ q > h, d e c l a r i n g t h a t the s t a t e of the object observed cannot be known for the reason that it is altered by the very act of observation. But it is a certainty that The Radiochemical Centre, which is operated by the United Kingdom
A t o m i c Energy A u t h o r i t y , h a s m a d e its own m a r k in history. And it's a certainty that G. D. Searle & Co. has earned eminence in pharmaceutical research. If it is a labelled c o m p o u n d , you can be certain of the highest specific activity and the chemical and radiochemical purity. If it is a radioisotope, a solution or liquid scintillation standard, anything from our comprehensive line of n u c l e a r l a b o r a t o r y s u p
plies and accessories, it is r i g h t exactly. If it is information or any other service, you can count on it. Call our C u s t o m e r Service Depart m e n t in Des P l a i n e s , I l l i n o i s . That's what we're here for. Find out about our labelled com pounds. S e n d for our first edition.
there's one thing you can be certain of Dr. Heisenberg
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"From THIRTY YEARS THAT SHOOK PHYSICS by G. Gamow, illus. by G. Gamow, copyright 1966 by Educational Services, Inc., pub. by Doubleday & Co., Inc." Circle No. 4 on Readers' Service Card
ANALYTICAL CHEMISTRY, VOL. 42, NO. 1, JANUARY 1970
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