You must make up your mind to steady and earnest work.

You must be content to get on slowly if you only get on thoroughly....
"The phrase 'popular science' has in itself a touch of absurdity.

That knowledge which is popular is not scientific.
"The laws which govern the motions of the sun, the earth, planets, and other bodies in the universe, cannot be understood and demonstrated without a solid basis of mathematical learning.
* * * * * "Every formula which expresses a law of nature is a hymn of praise to God.
* * * * * "You cannot study anything persistently for years without becoming learned, and although I would not hold reputation up to you as a very high object of ambition, it is a wayside flower which you are sure to have catch at your skirts.
"Whatever apology other women may have for loose, ill-finished work, or work not finished at all, you will have none.
"When you leave Vassar College, you leave it the _best educated women in the world_.

Living a little outside of the college, beyond the reach of the little currents that go up and down the corridors, I think I am a fairer judge of your advantages than you can be yourselves; and when I say you will be the best educated women in the world, I do not mean the education of text-books, and class-rooms, and apparatus, only, but that broader education which you receive unconsciously, that higher teaching which comes to you, all unknown to the givers, from daily association with the noble-souled women who are around you." "1871.

When astronomers compare observations made by different persons, they cannot neglect the constitutional peculiarities of the individuals, and there enters into these computations a quantity called 'personal equation.' In common terms, it is that difference between two individuals from which results a difference in the _time_ which they require to receive and note an occurrence.