carbon of the food and the oxygen respired; hence the "bone disorder," not being persistent, is only a result--a symptom; and as such we view it. As far as we have been able to ascertain the nature of the malady, as manifested by the symptoms, (_caving in_, _wasting_, _absence of phosphate of lime in the milk_, &c.,) we give it as our opinion,--and we think our medical brethren will agree with us, (although we do not often agree,)--that "bone disorder" is a symptom of a disease very prostrating in its character, originating in the digestive organs; hence not confined to the bones, but affecting all parts of the animal more or less. And the only true plan of treatment consists in restoring healthy action to the whole animal system. The ways and means of accomplishing this object are various. If it is clearly ascertained that the animal system is deficient in phosphate of lime, we see no good reason why bone meal should not be included among our remedial agents; yet, as corn meal and linseed contain a large amount of phosphate, we should prefer them to bone dust, although we do not seriously object to its use. The value of food or remedial agents consists in their adaptation to assimilation; in other words, an absence of chemical properties. These may be very complex; yet, if they are only held together by a weak chemical action, they readily yield to the vital principle, and are transformed. Atoms of bones are held together by a strong chemical affinity; and the vital principle, in order to convert bone dust into component parts of the organism, must employ more force to transform them than it would require for the same purpose when corn meal or linseed were used, their chemical affinity being weaker than that of bones. In the treatment of any disease, we always endeavor to ascertain its causes, and, if possible, remove them; and whatever may be indicated we endeavor to supply to the system. Thus, if phosphates were indicated, we should use them. In cases of general debility, however, we should prefer linseed or corn meal, aided by stimulants, to bone dust. Why not use the bone dust for manure? The animal would then have the benefit of it in its fodder. In reference to a deficiency of phosphate of lime in the milk, we would observe, that it may result either from impaired digestion, (in such cases, a large amount of that article may be expelled from the system in the form of excrements,) or the food may lack it. We then have a sick plant, for we believe that the phosphate of lime is as necessary for the growth of the plant as it seems to be for animal development. If the plant lacks this important constituent, then its vitality, as a whole, will be impaired. This is all we desire to contend for in the animal, viz., that the disease is general, and cannot be considered or treated as a local affection.