279 patients with the prostatic hypertrophy were investigated. They were visited to the Department of Dermato-Urology, Okayama University Hospital for 7 years from 1948 to 1954 and investigated about the following 16 articles. (1) Frequency of the patients and the classification of the stages of the diseases: total average rate to the total urological patients was 3.1% and the highest was the second stage of the prostatic hypertrophy through 7 years. (2) Age at admission: 43.5% were between 60 and 70 years of age. (3) Duration from onset to admission: 63.9% of patients were visited within one year from onset. (4) Past history: gonorrhoea were found to be the most highest percentages among the others, that is 42.1%. (5) Occupation: the order was farmer, no occupation and followed business man. (6) Season at admission: no special relation was found at all seasons of the year. (7) Constitution and nutrition: most of them were found in well nourished and fine built. (8) Subjective complaint: frequency of urination was first and then followed obstruction, weak urinary stream and residual sensation of micturition. (9) Residual urine: about 50 cc of the residual urine was found in the highest percentage. (10) Rectal examination of the prostate: mostly slight enlarged of prostate and then hen-egg sized, surfaces of the tumors were smooth and induration were moderately elastic and most of them had no pain being due to the pressure by finger. (11) Length of urethra, penis and perimeter of penis: average measurements were as followed. Averaged urethral length 20.1 cm; length of penis 11.4 cm; perimeter of penis 7.7 cm. (12) Bladder capacity: mostly 301-400 cc. (13) Trabecula of the mucous membrane of the bladder: most of them were found in the second stage. (14) Blood pressure: mean blood pressure was 129 mmHg. and the highest was 170 mmHg. (15) Renal function: (1) dilution ad concentration test. (2) phenolsulfonphthalein test. (3) indigo-carmine excretory test. The results were divided into two groups. One was good and the other was bad. Much of them were found in good in the second stage and bad in the third stage. (16) Complications: many of them were acute and chronic epididymitis, atrophy of testis, cystitis and vesical calculus.