"It has been said, and with more than element of truth, that the least important part of education is the acquisition of knowledge. The facts of nature, as such, have intense fascination for the nature-lover, yet the value of a mere knowledge of facts may easily be over-estimated. Facts are really s, the value of which lies in the uses to which they may be put. Of far deeper importance, therefore, than the mere committing of facts to memory, is the acquisition of correct habits of study. Habits, that is, of patient and accurate observation, and of clear and logical interpretation and correlation of the facts observed. Facts may be forgotten, but habits remain."