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Using the stunting of vertebral growth of one-week-old inbred WHT/Ht mice as the biological test material and Fricke's ferrous sulphate method for dose measurements, the biological effectiveness of 30 MeV electrons relative to 250 kVp X rays has been found to be in the region of 0·82. No difference of statistical significance has been observed in the RBE of 30 MeV electrons given as single doses of 500 and 750 rads at per cent depth-dose levels varying from 100 to 10 in the case of the former and 100 to 15 in the case of the latter.

Domestic ducks were adenohypophysectomized and 2–3 weeks later were loaded with hypertonic saline. Normal intact ducks and sham-operated ducks were similarly treated. For 2 hr. nasal gland secretion was almost completely inhibited (0·20 g.) in the adenohypophysectomized ducks and was significantly reduced (4·93 g.) in the sham-operated ducks compared with the normal intact controls (14·74 g.).When the renal response of the adenohypophysectomized ducks was compared with that of the normal intact controls no significant difference was found as far as volume of urine and concentration of Na+and K+were concerned. When compared with sham-operated controls, however, these values were significantly lower in adenohypophysectomized ducks.The adrenal weight was not significantly reduced in the adenohypophysectomized ducks, but the weights of thyroid, nasal gland and testis decreased significantly. Histological examination of the adrenal glands of the adenohypophysectomized ducks showed that the central regions were atrophic while the peripheral regions remained normal. Nasal glands, thyroid glands and testes were also examined.It is concluded that the adenohypophysis plays a major part in regulating extrarenal excretion.