Abstract
1. 1. We have demonstrated the presence of a labile antigen in fresh fruit extracts. Deterioration is rapid, occurring in largest proportion within twenty-four hours and being complete within one to three days. 2. 2. This antigen is either altered or destroyed by heat during both the canning and stewing processes. 3. 3. Rapid freezing (as in frozen fruits) seems to preserve the allergenic properties of fresh fruits. 4. 4. Seitz filtration materially reduces the potency of the freshly extracted juice. 5. 5. The lability of the antigen in fresh fruit juice probably accounts for the frequent failure to obtain positive skin reactions in clinically sensitive patients even with the concentrated stock extracts.
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