throw your stopcock pullers away And while you're a t it, throw those tubes of stopcock grease too. Lab-Crest stopcocks need no grease . . . never freeze! Lab-Crest Burettes have been used daily for up to two years in I N N a O H without lubrication or freezing . . . without dry deposits or cleaning chores. In solvent use, Lab-Crest assures samples free from dissolved stopcock grease. A boon to infrared analysis, this feature also simplifies techniques in blood cholesterol determinaCircle No. 40 on Readers' Service Card
tion, vitamin Bi determinations, and chromatography. Look for the Lab-Crest seal on burettes, separatory funnels, chromatography columns, and other laboratory glassware. I t ' s your assurance of these advantages. Write for your copy of new Catalog 80C100, Fischer & Porter Co., 1539County Line Road, Hatboro, Pa.
