See that speck? Nothing much, is it? Unless you need its molecular structure. That's another story. The Sadtler story. Analysis of unknowns for nearly a century. And 115,000 IR, UV, NMR and DTA standard reference spectra. Indexed to feel like 10. In our Spec-Finders, of course. Write or call. Sadtler Research Laboratories, Inc., 3316 Spring Garden St., Phila., Pa. 19104, (215) EV 2-7800.
