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A similar uncertainty attaches to the spermatic fluid.

From this point there passes forward to the right side of the head a groove—the spermatic groove—down which the spermatic fluid passes.

If the fish are caught before the time of beginning to spawn, the eggs and the spermatic fluid will not be mature, and will be only extruded by hard pressing, and failing to be fecundated, the eggs will perish.

Then take the male-fish, and go through the same process, which will press out the spermatic fluid, which should be allowed to fall into the same vessel with the eggs; stir up the whole together, and, after it has stood fifteen minutes, pour off the water, put in more and stir it up, and let it stand as before.

All we have to do is separate the girl's blood type from that of the spermatic fluid.