Best way to keep the

brew cool • • •

JFFPCOOL *JE™ rvvWk

P-ZOO.

Extremely low toxicity and superior corrosion protec­tion make JEFFCOOL® P-200 (inhibited propylene glycol) unsurpassed as a heat-transfer medium in beer cooling applications. Several major breweries are presently using P-200 for cooling beer storage and fermentation tanks. One of these, a major southwestern brewery, has reported that maintenance costs due to corrosion have been minimal since conversion to JEFFCOOL P-200. For any application where foods or beverages are involved, specify JEFFCOOL P-200. For all other coolant and heat-transfer applications, try JEFFCOOL E-100 (inhibited ethylene glycol). Write for technical data... Jefferson Chemical Company, Inc., P. O. Box 53300, Houston, Texas 77052.

Jefferson

Expanded periite particle rendered about 1,900 times actual size to show its glasslike cellular structure. When shattered, this structure pro­duces one of the world's great filteraids because every fragment has all curved surfaces forming an almost incompressible filter cake. From the DICALITE periite collection.

Photomicrograph by Richard B. Hoover

I Dark field photomicrograph of the diatom PINNULARIA DACTYLUS. Magni f icat ion is approximately 1,000 t imes actual size. From the " DICALITE diatom collection.