Take pure anhydrous phosphoric acid forty-eight grains, pure caustic (unslaked) lime forty-two grains. Finely pulverize each separately, and keep them separate in well-stopped bottles till wanted. For use, mix the required quantity in a small mortar, as rapidly and perfectly as possible, and at once press the dry mixture in the cavity of the tooth. The surface should then be smoothed off and finished by moistening with water. This cement soon acquires great hardness; it is very white and durable, and in its composition resembles the natural earthy matter of the teeth. The whole process requires expertness to succeed; but the latter, when attained, will amply repay for one or two failures. If the composition be not mixed and applied quickly it becomes moist, and is therefore unfit for use. In many cases the odour arising from carious teeth is very offensive; to remedy this, the mouth should be well rinsed with a tea-spoonful of the solution of chloride of soda in a tumbler of water, which will have the desired effect. PRESERVATION OF THE HAIR. Under ordinary circumstances, the hair may be preserved by the most simple means. In a sound and healthy constitution, the best preserver and beautifier of the hair is regular and careful cleaning. As a general rule, _the head cannot be too much brushed_, brushing serving as an active and healthy stimulant upon the skin, rendering the functions more vigorous, and, as a consequence, the production of hair more easy and its maintenance more certain. On this account, hard and penetrating brushes are useful, but in using them it should be borne in mind that it is the _head_ which requires brushing more than the hair; while, therefore, the brush is actively applied to the roots of the hair, the surface should be brushed with a light and gentle hand. Occasional washing with pure water is to be recommended, providing the hair is not very long, so as to render drying difficult. To assist in drying it thoroughly, dip the brush into a very little hair powder and brush it out again; after that, a little pomatum may be brushed in. With regard to _cutting the hair_, it is an operation which should not be performed too frequently, nor delayed too long; in ordinary cases, it would be well to have a small portion of the hair removed every month or six weeks. Where the hair is in an unhealthy condition, especially where much has fallen off, and a partial and impoverished growth has risen up to represent that which is lost, the short and impoverished hairs should be carefully and persistently cut, with the view of giving them bulk and strength, and improving their growth. The frequent plucking out of withered hairs is also productive of benefit, as the process is necessarily accompanied by much stimulation of the skin, which promotes the growth of the hairs individually and generally.