SEEDS of two different lots (line 208 and line 215) of the same autodiploid L. pimpinellifolium were exposed to thermal neutrons in the reactor at Brookhaven National Laboratory in February 1955. Part of the seed was exposed dry (about 8 per cent moisture) and another part exposed wet (soaked 24 hr. at 25° C. and then sealed in plastic bags at 3° C. for irradiation). Wet seeds were saturated with water and, except for the 24-hr. soaking period and the period of irradiation exposure, were kept at 3° C. until dry again.