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The authors studied the physiology of human uterine muscle contraction. Clinical experimental results obtained from elementary electrophysiological, electrohysterographic and pharmacological studies using PGs suggested that uterine muscle contraction does not originate in "pacemaker" areas. These data also showed that the electric phenomenon is not propagated along preferential "rails".

The Authors have studied the T3, T4 and TBG behaviour at the end of pregnancy and after 96 h and 144 h from delivery in 25 pregnant women. The patients have been randomly divided into two groups: the first was studied in basal conditions and the second after administration of enantate testosterone and valerianate estradiol. In the first group T3 and T4 values increased slightly. A higher increase was noticed from the 96th to the 144th h from delivery. In the second group T3 and T4 values were discording.

Human growth hormone (HGH) has been measured in the plasma of 30 subjects at term of pregnancy, at 96 and at 144 h after delivery. The subjects were then selected into three groups: 10 were studied in basal conditions, 10 were given pyridoxine, 10 were given enantate testosterone and valerianate estradiol. In the first group the correlation index (t of Student) was not significant showing the lack of correlation among the tested averages. IN the second group the index of Student was weakly significant (t = 2.36, p less than 0.05). In the third group the Authors found a high representative correlation between the term of pregnancy and the 144th hour after delivery (t = 3.81, p less than 0.01) and between the 96th and 144th hour after delivery (t = 2.95, p less than 0.01).