“…The question whether or not the normal sexual cycle is inherent and independent of changes in the length of day is undecided. Uotila, 1939;Lowe, Ivy & Brock, 1945) it seems doubtful that cervical sympathectomy would cause depression of thyroid function. On the other hand, thyroid function might be modified as a result of a disturbance arising from operative interference in this region.…”