The world of learning is so broad, and the human soul is so limited in power!

I made observations for three hours last night, and am almost ill today from fatigue; still I have worked all day, trying to reduce the places, and mean to work hard again tonight.

I am always the better for open-air breathing, and was certainly meant for the wandering life of the Indian.

There is something of the same pleasure in noticing the hues of the stars that there is in looking at a flower garden in autumn.

I had only ordinary capacity but extraordinary persistency.

Altogether, St. Louis is a growing place, and the West has a large hand and a strong grasp.

I am just learning to notice the different colors of the stars, and already begin to have a new enjoyment.