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 Holmes, of Castle Rock station, Southland, wrote to Professor Black, almost in despair, to see if he could suggest any remedy. After some consideration the professor recommended the trial of the bisulphide of carbon and himself superintended the experiments. The rabbits were first of all hunted into the warrens by dogs. A rag or stem of the common New Zealand flax (phormium), dipped in the bisulphide, or a spoonful of the liquid itself, was then put into each hole in the warren and a sod was then stamped into each opening. The poisonous fumes are immediately generated and penetrate to the remotest recesses of the warren, and no live rabbit escapes the deadly dose.

For low lands this is the best remedy that was then known, and none better has been discovered since, and to Professor Black belongs the honour of having first suggested and tried it. It gives me genuine pleasure to be able to record this of an old fellow-student; for his modesty is only equalled by his high attainments.

During this digression the coach has been jolting on, and the weather has been clearing.

Right ahead, seemingly barring the valley, Mount Difficulty towers aloft. It is well named. Its black bare ribs are like the bones of some giant megatherium, which have been scorched and blackened by primeval fires. We cross the Victoria Bridge, and in the valley below, the Nevis here joins its waters to those of the Kawarau. The Nevis is muddy and thick as pea-soup from recent freshets.