Under the head of roborants we subsume such substances, either dietetic or remedial, which are known or believed to add to the ingredients of the organism in a form not requiring a great deal of change. Rachitical infants require them at an early period. Meat-soups, mainly of beef, and of mutton in complications with diarrhoea, ought to be given at once when the diagnosis of rachitis becomes clear or probable. Any mode of preparation will prove beneficial; the best way, however, is to utilize the method used by Liebig in making what he called beef-tea. A quarter of a pound of beef or more, tender and lean, cut up finely, is mixed with a cup or a tumbler of water and from five to seven drops of dilute muriatic acid. Allow it to stand two hours and macerate, while stirring up now and then. This beef-tea can be much improved upon by boiling it a few minutes. It may be given by itself or mixed with sweetened and salted barley-water or the usual mess of barley-water and milk which the infant has been taking before. Older infants, particularly those suffering from diarrhoea, take a teaspoonful of raw beef, cut very fine, several times a day. It ought not to be forgotten, however, {162} that the danger of developing tænia medio-canellata from eating raw beef is rather great. Peptonized beef preparations are valuable in urgent cases. Iron must not be given during any attack of catarrhal or inflammatory fever. The carbonate (cum saccharo) combines very well with bismuth; a grain three times a day, or less, will answer well. The citrate of iron and quinine (a few grains daily) can be given a long time in succession. The syrup of the iodide of iron (three times a day as many drops as the baby has months up to eight or ten), in sweetened water or in sherry or malaga, or in cod-liver oil, acts very favorably when the case is, as so frequently, complicated with glandular swelling.