SCIENCE with a feathery coagulum. When the tube was moved, the coagulum separated from wall of the tube and settled t o the bottom, leaving the solution i n t h e tube perfectly clear. F u r t h e r exposure of 20 hours produced only one or two scarcely visible masses of coagul u m i n the clear solution above the coagulum a t t h e bottom of the tube. The solution cQntained, however, a n abundance of albumin which could be coagulated by heat. Experiments with Ox-serum.-The ser u m was prepared

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... by allowing a clot t o form and then decanting off t h e clear liquid. A portion of this was placed i n a quartz test tube and exposed to t h e light a t room temperature. A s i n t h e other cases a coagulum formed in t h e quartz tube while none formed in the glass tube which was exposed a t t h e same time. T h e coagulum produced by the light i n eggwhite and egg-albumin is insoluble i n alcohol, hot or cold water and dilute acids. It is soluble i n dilute alkalies. In these respects it agrees with t h e ordinary coagulum which is produced b y heat without exposure to ultraviolet light.