There are composites of sensation which the baby experiences very early. There is the feeling of clothes, for instance, made up of warmth, of touch and pressure sensations all over his skin, and of changes in the muscular feelings from constraint, and in the internal feelings from the effect on circulation. There are feelings of fatigue in one position, made up of sensations of touch, of the pressure of the body’s weight on the under surfaces of skin, of some muscular tensions, and perhaps of several other elements. Our baby’s nurse saved her much fretting by simply changing the position of the little body from time to time. We ourselves are constantly moving and shifting our positions, to relieve a pressure on the skin here, or a muscular tension there, but the wee baby cannot so much as turn his head or move a limb at will. Vaguest and most composite of all is what is called “common sensation,” or “general sensation”--that feeling of comfort or discomfort, vigor or languor, diffused through the whole body, with which we are all familiar. It seems to be very primitive in origin--indeed, the speculation is that this dim, pervasive feeling is the original one, the primitive way in which animal tissue responded to light and heat and everything, before the special senses developed, gathering the light sensations to one focus, the sound sensations to another, and so on. But in its present development it is also largely made up of the sum of all the organic sensations, and even of dim overflows of feeling from the special senses. It is with older people notably connected with emotional states. It varies, of course, with health and external conditions; yet each person seems from birth to be held to a certain fixed habit in this complex underlying condition of feeling--pleasant with one, unpleasant with another. This fixed habit of general sensation is perhaps the secret of what we call temperament; while its surface variations seem to be mainly responsible for moods. Our baby showed temperament--luckily of the easy-going and cheerful kind--from her first day (though we could hardly see this except by looking back afterward); and there is no reason to doubt that she experienced some general sensation from the first. It was evidently of a pretty neutral sort, however: the definite appearance of high comfort and well-being did not come till later; nor were moods apparent at first.