FIG. 21. Incidence of spring, autumn and winter tetany as a function of temperature and rainfall
N.B. 1. The curves indicate the maximum and minimum temperatures observed.
        2. The number of cases is that observed in cows of the South Devon breed by a veterinary practitioner in the Tavistock area, on the Devon-Cornwall border, 12 miles north of Plymouth.
        3. Cf. Figs. 20 and 22.
From MACKELLAR