Pediococci residing on plants.

The pediococci residing on plants resemble the lactobacilli, but they differ from the streptococci in their limited distribution and low population level on plants. They are a subgroup within the genus Pediococcus which grow freely in neutral media and require neither NaCl nor CO(2). They are most readily recognized by the ability to initiate growth in liquid media, acidified to pH 5.

Lentigo maligna and malignant melanoma.

Lentigo maligna, a precancerous lesion, is a brown-black irregularly pigmented freckle, usually occurring on the face of the elderly subject. In a series of 99 patients with malignant melanomas, lentigo maligna was the pre-existing lesion in 21. The clinical and histological findings, and previous publications on the subject are reviewed.

THE RELATIVE REACTION WITHIN LIVING MAMMALIAN TISSUES : IX. ON THE TISSUE REACTION AS INFLUENCED BY INHALATIONS OF CO(2)AND BY OVERBREATHING.

Breathing an atmosphere that contains the normal amount of oxygen but a large excess of carbon dioxide results in a tissue acidosis as well as one of the blood. The extravascular changes in reaction take place with far greater speed than when acidosis is induced with hydrochloric acid, and they do not persist as in the case of this latter but swiftly disappear when the animal breathes ordinary air once again. The changes parallel closely in magnitude and time those occurring in the blood.

THE RELATIVE REACTION WITHIN LIVING MAMMALIAN TISSUES : VIII. ON THE COURSE OF THE TISSUE ACIDOSIS SECONDARY TO BLOOD ACIDOSIS INDUCED WITH HYDROCHLORIC ACID.

The changes in blood reaction caused by the injection into a vein of a weak solution of hydrochloric acid are accompanied by extravascular changes of similar magnitude within the subcutaneous tissue. Under the conditions of prolonged general anesthesia with ether or urethane the circulation to this tissue is so interfered with that an "outlying acidosis" may develop in addition to the acidosis immediately consequent on the blood state. Even under the best of circumstances the extravascular acidosis induced with hydrochloric acid affects not merely the tissue fluid but the reaction of the tissue itself.

THE RELATIVE REACTION WITHIN LIVING MAMMALIAN TISSUES : VII. THE INFLUENCE OF CHANGES IN THE REACTION OF THE BLOOD UPON THE REACTION OF THE TISSUES.

The introduction into the blood stream of dilute hydrochloric acid or sodium carbonate in quantities not too great to be compatible with life results in marked alterations in the color of certain of the matrix tissues stainable in vivo with phthalein indicators. Connective tissue in its various forms, and tendon and cartilage all become relatively more acid or alkaline than the normal. The hue of the kidney cortex also changes, as might be expected from its functions.