It is the most difficult one that can be made with the number of figures contained in it, and I do not think that any of you can do it, but you may try.

I shall not be surprised if every answer should contain mistakes." To the other class say as follows: "I have prepared an example for you, which I wish you to be very careful to perform correctly.

It is a little longer than those you have had heretofore, but it is to be performed upon the same principles, and you can all do it correctly, if you really try." Now under such circumstances the first class will go to their seats with ardor and alacrity, determined to show you that they can do work, even if it is difficult; and if they succeed, they come to the class the next day with pride and pleasure.

They have accomplished something which you admit it was not easy to accomplish.

On the other hand, the second class will go to their seats with murmuring looks and words, and with a hearty dislike of the task you have assigned them.