The human baby, even if premature, shows evidence of homeothermy (Bruck, 1961; Day, Curtis, and Kelly, 1943). When subjected to a cool environment, his metabolic rate increases in an attempt to keep pace with increased heat loss. When subjected to an excessively warm environment, he becomes restless and active with hurried panting respiration so that again metabolic rate is increased. Between t...

Background: Male reproductive disorders that are of interest from an environmental point of view include sexual dysfunction, infertility, cryptorchidism, hypospadias and testicular cancer. Several reports suggest declining sperm counts and increase of these reproductive disorders in some areas during some time periods past 50 years. Materials and Methods: Except for testicular cancer this evide...