A child has only two distinct feelings, joy and sorrow; he laughs or he cries; he knows no middle course, and he is constantly passing from one extreme to the other. On account of these perpetual changes there is no lasting impression on the face, and no expression; but when the child is older and more sensitive, his feelings are keener or more permanent, and these deeper impressions leave traces more difficult to erase; and the habitual state of the feelings has an effect on the features which in course of time becomes ineffaceable. Still it is not uncommon to meet with men whose expression varies with their age. I have met with several, and I have always found that those whom I could observe and follow had also changed their habitual temper. This one observation thoroughly confirmed would seem to me decisive, and it is not out of place in a treatise on education, where it is a matter of importance, that we should learn to judge the feelings of the heart by external signs. I do not know whether my young man will be any the less amiable for not having learnt to copy conventional manners and to feign sentiments which are not his own; that does not concern me at present, I only know he will be more affectionate; and I find it difficult to believe that he, who cares for nobody but himself, can so far disguise his true feelings as to please as readily as he who finds fresh happiness for himself in his affection for others. But with regard to this feeling of happiness, I think I have said enough already for the guidance of any sensible reader, and to show that I have not contradicted myself.