Multiple separate tumors arising in the major salivary glands are distinctly unusual. The records on 25 patients with synchronous unilateral salivary gland tumors on file at St Louis University and at the Armed literature. Bilateral tumors arose more frequently than multiple unilateral ones. The most common tumors with bilateral synchronous or metachronous development are the Warthin tumors, with more than 100 reported cases; the mixed tumor with at least 34 cases; and the acinic cell carcinoma, with 12 reported cases. The Warthin tumor also was the most likely to present with multifocal unilateral involvement with 29 tumors having three or more separate foci of tumor. The next most common tumor combinations are a Warthin tumor and a mixed tumor (20 cases), the multifocal membranous basal cell adenoma (12 cases), and multiple oncocytomas (nine cases). Numerous other tumor combinations were found covering the range of salivary gland neoplasia, however one of the tumors usually was a mixed tumor or a Warthin tumor.

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Sera of 10 patients with silicosis and round nodular fibrosis of the lung in the absence of rheumatoid arthritis had positive rheumatoid factor tests. The proteins responsible for this were identical or at least closely related to those seen in patients with rheumatoid arthritis. It was not possible to induce “rheumatoid factor‐like” proteins in rats and guinea pigs by prolonged injections of silica. The possible significance of these proteins in the pathogenesis of the disease is discussed.

The stresses to which the steel in a boiler is subjected may be divided into (a) static stresses and (b) repeated stresses. A great deal of experimental work at boiler-water temperatures has been directed toward the determination of the effect of solutions on the physical properties of the steel as measured by static tests, but repeated-stress testing under these conditions has received comparatively little attention. In the investigation discussed in this paper, repeated torsion testing with a rather slow repetition of the stress was used to measure the comparative effect of air, water, sodium hydroxide, and other solutions on steel at 482 F. Under the conditions investigated it was found that water caused failure more rapidly than air, and sodium hydroxide caused failure more rapidly than water. Sodium chloride and sodium sulphate in water solution had no different effect from that of water alone. Sodium carbonate and tri-sodium phosphate in water had about the same effect as sodium hydroxide. The addition of sodium carbonate in solution, or sodium sulphate as excess solid to the sodium hydroxide did not prevent the action of the sodium hydroxide in these repeated torsion tests. It was found that by the addition of either sodium or potassium chromate, or sodium nitrate to the sodium-hydroxide solutions, the action of the sodium hydroxide could be prevented and the endurance of the specimen under the test conditions could be brought up to a value at least as high as that for water alone. The endurance of the specimens does not appear to have been directly related to surface corrosion or pitting.