[54] There is no relation whatever between the acidity of canned vegetables and their possible contamination with tin. Experiments carried out to determine this question demonstrated, for example, that a "sample of red kidney beans showing the highest acidity contained the least tin," and that those samples containing the most tin were all relatively low in acidity. (Report of Conn. Agric. Station Bull. 200, 1917, J. P. Street.) Another antiscorbutic which can be used in a routine way to prevent infantile scurvy is _swede juice_, prepared by grating the raw vegetable and squeezing the pulp in muslin. Chick and Rhodes report that this juice has been adopted for use in some of the English infant-welfare centres. It should be given in about the same dosage as the tomatoes, and seems applicable where the swede can be readily obtained. For babies over six months of age, reliance may be placed on the ordinary household vegetables--potatoes, spinach, carrots, squash, etc. Attention should be paid to the amount which is taken, as one or two teaspoonfuls of a vegetable which is poor in antiscorbutic power, such as carrots or beets, will be insufficient to protect against scurvy. Especially is this true if the vegetables are old and stale and are cooked for a long period;[55] some years ago two infants under our care developed scurvy in spite of a small daily ration of vegetables. [55] Salant, in experiments on rabbits, found that old or winter carrots did not have the same protective action against tartrates as young carrots, although their diuretic action is the same. Potato in the amounts usually consumed is a valuable antiscorbutic. It is not an exaggeration to state that it is the main antiscorbutic bulwark of man. In giving baked potato to children it is commonly advised to use the floury part just beneath the peel; this should be put through a sieve and mixed thoroughly with boiled milk so as to constitute a cream; for younger babies it can be prepared with water to form a diluent similar to the barley water so commonly employed to dilute cow's milk (1 tablespoonful of potato to a pint of milk, cooked for 15 minutes). Little reliance should be placed on beef juice in the usual dosage and none on eggs.