Plasma obtained from tuberculous rabbits within 3 or 4 months following inoculation with bovine tubercle bacilli exerted a growth-inhibitory influence on transplants of rabbit fibroblasts; while that obtained after the 4th month was growth-stimulating. It is suggested that the growth-inhibitory factor was linked in part with lipoidemia; while the growth-stimulating elements were associated with the period of leucocytosis.

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