But I weary you with my hobby." "Not at all," I answered, earnestly.

"It is of the greatest interest to me, especially since I have had the opportunity of observing your practical application of it.

But you spoke just now of observation and deduction.

Surely the one to some extent implies the other." "Why, hardly," he answered, leaning back luxuriously in his arm-chair, and sending up thick blue wreaths from his pipe.

"For example, observation shows me that you have been to the Wigmore Street Post-Office this morning, but deduction lets me know that when there you dispatched a telegram." "Right!" said I.