There is a phenomenon very similar to this bastard spermatorrhœa, and which shows itself when the patient is inclined to indulge in coition or masturbation: the emission of semen takes place on the commencement of the act of venery. It is a quasi involuntary pollution. In this case, which is by no means rare, the erection is not complete, simply because there is not time for it to be so, the premature emission of semen not admitting it to be perfect. Sometimes, erection is radically impossible, and prevents the ejaculation. This was the case with the onanist who wrote to Tissot, that the semen would flow, but there was no ejaculation. Farther: when there is no erection, either because this is impossible, or because the semen is discharged prematurely, the person becomes impotent, because the power of procreating requires erection and ejaculation.
In persons affected with spermatorrhœa, the seminal fluid must preserve its normal characters. It is generally thinner, less opaque, and similar to serum: sometimes it resembles a fetid sanies or corrupt mucus; in other cases:, the seminal vesicles are evidently affected. Sometimes, blood is exhaled from these vesicles, and is even ejaculated. We have already stated instances of this emission. Tissot, also, has published a case of it. It was a young man, less than sixteen years old, who indulged in onanism to such an extent, that blood was finally emitted, instead of semen. This emission was soon followed by excessive pains, and an inflammation of all the genital organs. We must remark, that blood never seems to be discharged, unless the pollution is excited directly: this, at least, would seem to follow from the cases stated, and particularly from one mentioned by Dalandeterie. The erections (said he) always terminate with a more or less abundant flow of mucus--perhaps, also, of prostatic fluid, or even of a very diluted semen. In ejaculations excited by the hand, a semi-clotted, blackish blood comes, instead of semen: sometimes, a teaspoonful is discharged. This is always attended with pains, and followed by great prostration.
We have seen that involuntary pollution may take place, like voluntary pollution, by the convulsive contraction of the ejaculatory muscles, with erection of the penis, and sensations of venery. We have also seen, that the semen may be discharged, although the erection of the penis, the sensation of venery, and the convulsive contraction of the ejaculatory muscles is slight, and almost nothing. When this exists to a still greater degree, we have _non-convulsive_ spermatorrhœa, or _diurnal involuntary pollution_, as it is called: here there is no erection, convulsion, nor ejaculation; there is no feeling of venery; the semen flows, instead of being expelled; and there is no feeling of pleasure attending this discharge.