Abstract
Dry dormant Wilson black soy beans were irradiated with soft X-rays (maximum intensity at 1.54 A.). The leaves on plants grown from these seeds showed 6 types of injury, judged by external appearance and internal structural changes. Light areas had less than the normal number of chloro-plasts and a small amount of chlorophyll; dark areas had enlarged chloroplasts, often clumped together, with much chlorophyll; albino areas had very few chloroplasts with no chlorophyll and greatly altered cell shapes. Large X-ray dosages tended to produce globular cells with abnormally arranged contents and to produce imperfectly developed leaves.

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