In case of abscess an opening by the side of the anus is preferable to one by the urinary passages or rectum, and will obviate the danger of rupture into the peritoneum. A pasty or fluctuating swelling in the perineum should be incised until the pus flows. A tense elastic fluctuating prostate may be transfixed by a cannula and trochar from the side of the anus, guided by the hand or finger in the rectum. When the pus has been evacuated a drainage tube may be inserted through the cannula and left in place when the latter is removed so as to allow free drainage at all times and frequent antiseptic injections. Punctures and even incisions have been made from the rectum, but they make badly infected wounds, and a rupture into the urethra, determines infection on that side, without any possibility of any effective antiseptic injection or perfect drainage. As injections may be used permanganate of potash 1:10000, or boric acid, a saturated solution. Poisonous agents must be eschewed or used with the greatest circumspection. CHRONIC PROSTATITIS. Causes. Follows acute. Same causes less potent. Lesions: as in acute, or sclerosis, and abscess. Symptoms: delayed urination, last glairy or purulent, constipation, defecation followed by urethral discharge, little genital ardor, rectal palpation, tenderness of prostate to hand or catheter, atony of hind limbs. Treatment: open air life, idle, milk or succulent diet, saline laxatives or enemata, avoid generative excitement, castrate, check masturbation, iodine, camphor, antiseptic irrigations. _Causes._ The acute disease often subsides leaving an indolent chronic inflammation of the organ. Apart from this, the causes are essentially those of the acute, but acting with lessened force or on a less susceptible system. Thus indoor life and overfeeding, with constipation and urine of a high density, calculus, irritant diuretics, the frequent incautious use of the catheter, infection from the catheter or otherwise, intense and frequent generative excitement, and exposure to cold are all occasional factors. Old age is a common concurrent cause. _Lesions._ As in the acute form these indicate three successive, independent or concurrent forms, follicular, interstitial and suppurative. With the distinctively =follicular= form the gland is usually enlarged and of a deep red color, but soft and friable, and when compressed exudes from its follicles and gland ducts a whitish muco-purulent glairy liquid. With the =interstitial= changes, which are often an advance on the follicular, the organ may be enlarged or shrunken, but the connective tissue has undergone a thickening and sclerosis which renders the mass firm and resistant, and which may have extended to the tissues in the immediate vicinity. In the =suppurative= form or stage, foci of suppuration are found throughout the gland substance, bulging out on its surface and even encroaching on surrounding tissues.