We have explained the reason for this advice in many places in the book. The degree of concentrated attention bestowed upon the object under consideration, determines the strength, clearness and depth of the impression received and stored away in the subconsciousness. The character of these stored away impressions determines the degree of ease in remembrance and recollection. POINT II. _In considering an object to be memorized, endeavor to obtain the impressions through as many faculties and senses as possible._ The reason for this advice should be apparent to you, if you have carefully read the preceding chapters. An impression received through both sound and sight is doubly as strong as one received through but one of these channels. You may remember a name, or word, either by having seen it in writing or print; or else by reason of having heard it; but if you have both _seen and heard_ it you have a double impression, and possess two possible ways of reviving the impression. You are able to remember an orange by reason of having seen it, smelt it, felt it and tasted it, and having heard its name pronounced. Endeavor to know a thing from as many sense impressions as possible--use the eye to assist ear-impressions; and the ear to assist in eye-impressions. See the thing from as many angles as possible. POINT III. _Sense impressions may be strengthened by exercising the particular faculty through which the weak impressions are received._ You will find that either your eye memory is better than your ear memory, or vice versa. The remedy lies in exercising the weaker faculty, so as to bring it up to the standard of the stronger. The chapters of eye and ear training will help you along these lines. The same rule applies to the several phases of memory--develop the weak ones, and the strong ones will take care of themselves. The only way to develop a sense or faculty is to intelligently train, exercise and use it. Use, exercise and practice will work miracles in this direction. POINT IV. _Make your first impression strong and firm enough to serve as a basis for subsequent ones._ Get into the habit of fixing a clear, strong impression of a thing to be considered, from the first. Otherwise you are trying to build up a large structure upon a poor foundation. Each time you revive an impression you deepen it, but if you have only a dim impression to begin with, the deepened impressions will not include details omitted in the first one. It is like taking a good sharp negative of a picture that you intend to enlarge afterward. The details lacking in the small picture will not appear in the enlargement; but those that _do_ appear in the small one, will be enlarged with the picture. POINT V. _Revive your impressions frequently and thus deepen them._