THE ANTERIOR PITUITYARY SECRETES TWO GONADOTROPHINS FSH AND LH. BOTH ACT IN CONCERT TO PROMOTE GAMETOGENESIS AND SECRETION OF GONADAL HORMONES. FSH IN THE FEMALES INDUCES FOLLCULAR GROWTH, DEVELOPMENT OF OVUM AND SECRETION OF ESTROGENS. IN THE MALE IT SUPPORTS SPERMATOGENESIS AND HAS A TROPHIC INFLUENCE ON SEMINIFEROUS TUBULES. OVARIAN AND TESTICULAR ATROPHY OCCURS IN THE ABSENCE OF FSH. LH INDUCES PREVULATORY SWELLING OF THE RIPE GRAFFIAN FOLLICLE AND OVULATION IN FEMALE. IT THEN BRINGS ABOUT LUTENIZATION OF THE RUPTURED FOLLICLE AND MAINTAINS CORPOUS LUTEUM TILL THE MENSTRUAL CYCLE. PROGESTERONE SECRETION OCCURS ONLY UNDER THE INFLUENCE OF LH. IN MALE LH STIMULATES TESTOSTERONE SECRETION. INADEQUATE GONADOTROPHIN SECRETION RESULTS IN AMENORRHOEA AND STERILITY IN WOEMN : OLIGOZOO-SPERMIA, IMPOTENCE AND INFERTILITY IN MEN. MENOTROPHIN IS A PREPARATION OBTAINED FROM URINE OF MENOPAUSAL WOMEN.