I certainly was his friend all the firmer for it.
"I remember once asking him what was the best way to pursue a certain study.
"'Use several text-books,' he answered.

'Get the views of different authors as you advance.

In that way you can plow a deeper furrow.

I always study in that way.' "He tried hard to teach us to observe carefully and accurately.

He broke out one day in the midst of a lesson with, 'Henry, how many posts are there under the building down-stairs ?' Henry expressed his opinion, and the question went around the class, hardly any one getting it right.
Then it was, 'How many boot-scrapers are there at the door ?' 'How many windows in the building ?' 'How many trees in the field ?' He was the keenest observer I ever saw.