Guide to Advertised ProductsIn addition to the products advertised in this issue, the following items have been featured recently. Science provides this

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Product and Source Issue Page Circle Product and Source Issue Page Circle

Absorbance MonitorsISCO

Acid Digestion BombsParr Instrument

Amino Acid AnalysisEldex Laboratories

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Fermentors, MiniatureLKB Instruments

Filter PaperSchleicher & Schuell

Filter ProductsMillipore

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SCIENCE, VOL. 184

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-70CUltra-Cold.-.960CX -Ultra-oler.Both from Kelvinator Commer-cial. Upright drops to -76°C.Ultra-cold. Chest model dipsto -96°C. Ultra-colder. Up-right's six French doors openindividually. And you canlabel each door to know what'sinside. Easy labeling for what'sunder the chest's stainless steel ' -sliding lids, too. Want more?Automatic alarm systems? 2"portholes for recorders? TheKelvinator Commercial name?You got them. Don't be caughtin the cold without ultra-cold. \Contact J. E. Hirssig at Kelvinator\-Commercial, the company that knowshow to give you 12 cubic feet of the best cold you ever had:Upright UC-105 (-760C/-105'F) Chest UC-520 (-85°C/-120°F)Chest UC-540 (-96°C/-140°F)

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DOI: 10.1126/science.184.4137.714 (4137), 714-718.184Science 

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