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"It is simplicity itself," said he; "my eyes tell me that on the

inside of your left shoe, just where the firelight strikes it,

the leather is scored by six almost parallel cuts. Obviously they

have been caused by someone who has very carelessly scraped round

the edges of the sole in order to remove crusted mud from it.

Hence, you see, my double deduction that you had been out in vile

weather, and that you had a particularly malignant boot-slitting

specimen of the London slavey. As to your practice, if a

gentleman walks into my rooms smelling of iodoform, with a black

mark of nitrate of silver upon his right forefinger, and a bulge

on the right side of his top-hat to show where he has secreted

his stethoscope, I must be dull, indeed, if I do not pronounce

him to be an active member of the medical profession."