He must also reduce his knowledge to concrete, workable form, and be able to defeat opposing experts on their own ground.

But such knowledge comes only by prayer and fasting--or, perhaps, rather by months of hard and remorseless grind.
The writer once prosecuted a druggist who had, by mistake, filled a prescription for a one-fourth-grain pill of calomel with a one-fourth-grain pill of morphine.

The baby for whom the pill was intended died in consequence.

The defence was that the prescription had been properly filled, but that the child was the victim of various diseases, from acute gastritis to cerebro-spinal meningitis.

In preparation the writer was compelled to spend four hours every evening for a week with three specialists, and became temporarily a minor expert on children's diseases.