Below - Stills used to run quantitative assay for alcoholic content of tinctures and other fluids.

Below - rate of dissolution of aspirin. May 1936

Below - spectrum analysis of vitamin A with spectrophotometer.

Below - strictly aseptic surgical technique employed in pharmocologic assay of corpus luteum hormone.

Chick assay of vitamin D.

Below - sterility test of hypodermic solutions.

Below - Seeding flasks of media for bacterial vaccine manufacture.

Below - diluting the antigen for bacterial vaccine manufacture.

Below - the Mitchell (camera) peers at a Bacteriology Dept sterility test.

Below - harvesting bacteria from culture media.

Below - Shirley Anderson determines penicillin potency by cup-plate method with antbiotic zone reader.

Below - multiple tube holders being placed in bucket centrifuge for assay of diptheria toxin - antitoxin by the Collodiou Particle Flocculation Test.

Below - washing pertussis organisms by separating from saline solution in Sorval Angle Centrifuge. The angle of the tubes hastens the sedimentation of the cells.

Below - Kathleen Marks examining sterility control tubes in the 37 degree walk-in incubator.

Below - Gertrude Vanderhorst assaying streptomycin by the Turbidometric Method uding the Lumetron Colorimeter.

Below - determining the identity and purity of sulfadiazine by placing a capillary tube containing the drug in electrically heated mineral oil and noting the melting point.

Below  - on the right a Control inspector takes a bottle of Citrasulfas at random from the production line for inspection.

Below - assaying sulfa strenth of Citrasulfas by titration. The end point is a color change on the starch-iodide smear on the filter paper. February 1948. This looks to be a very young Pauline Wherly, who worked in Control for 42 years!

Below - viscosity determination equipment in the Control Laboratories, showing spindle about to be lowered into the sample of Citrasulfas. February 1948.

Below - taking a sample of suladiazine from a new shipment in the warehouse for testing. February 1948.

Below - taking a sample of citrasulfas from a mixing tank for assay.

Below - autoclave for sterilizing laboratory equipment.

Below the vacuum drier removes all moisture from samples of compounds to be analyzed.

Below - a young LeRoy Graham using a refractometer to measure the refraction of light passing through a film of oil at a definite temperature. This is a step in checking the purity of cod liver oil.

Below - testing physical properties of soft elastic capsules.

Below - fluoroscopic determination of vitamin B and G content.

Below - specific gravity test.

Below - Control inspection of sterile solutions in ampoules.

Below - an accurate method of determining melting points. The substance to be tested is spread along a gradiently heated bar of metal. Contact with the needle is then made on the bar at the point where melting begins. The thermocouple effect of the two different metals is measured, which enables the operator to determine the exact melting point.