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The relative gf-values of 256 lines in 58 multiplets in the spectrum of Co i have been measured in electric furnace absorption spectra. The lines lie in the wavelength range 2987–6450 A and arise from low terms whose excitation potentials are between 0.00 and 3.24 ev.

In 4 patients with excessive obesity (78.4—160.8 kg body-weight) the following determinations were performed before and during triiodo-thyronine treatment: the aldosterone excretion in the urine, the serum concentration of antidiuretic substances (ADH according to Buchborn), the osmolality, sodium, potassium and chloride in plasma and urine, the total and extracellular fluid compartments, the glomerular filtration rate (by inulin clearance), the renal plasma flow, and the circulating plasma volume.During triiodothyronine treatment, the previously increased levels of aldosterone in the urine and the serum ADH decreased towards the normal range. The glomerular filtration rate and the renal plasma flow, both as a rule significantly reduced in obesity, as well as the circulating plasma volume were increased. In all 4 cases, the administration of triiodo-thyronine was followed by distinct natriuresis, reduction of the cholesterol level in the serum, and an increase of the basal metabolic rate.A statistically significant relation could be demonstrated between the aldosterone excretion rate in the urine and the ADH concentration of the serum on the one hand and the circulating plasma volume on the other. This relation was also found between the aldosterone excretion and ADH concentration in the serum.

This paper discusses the formation of dislocation dipoles by the interaction of two dislocations. In particular a mechanism is described whereby two screw dislocations of the same sign can become cross linked to form an edge dislocation dipole at the cross-over point. Subsequently, the trailing segments of the cross-linked pair are held back by the dipole while the leading segments move on ahead stretching the dipole behind them. Evidence is presented for this mechanism based on electron transmission studies on thin films of magnesium oxide and its role in the early stages of work hardening is discussed. In a second mechanism edge dislocations of opposite sign approach and form a dipole along their line of contact.