We have frequently seen accounts, in various papers, of "bone disorder in milch cows." The bony structure of animals is composed of vital solids studded with crystallizations of saline carbonates and phosphates, and is liable to take on morbid action similar to other textures. Disease of the bones may originate constitutionally, or from derangement of the digestive organs. We have, for example, _mollities ossium_, (softening of the bones;) the disease, however, is very rare. It may be known by the substance of the bones being soft and yielding, liable to bend with small force. We have also _fragilitas ossium_, (brittleness of bones.) This is characterized by the bony system being of a friable nature, and liable to be fractured by slight force. We have in our possession the fragments of the small pastern of a horse, the bone having been broken into seventeen pieces, by a slight concussion, without any apparent injury to the skin and cellular substance; not the slightest external injury could be perceived. There are several other diseases of the bones, which, we presume, our readers are acquainted with; such as _exostosis_, _caries_, &c., neither of which apply to the malady under consideration. We merely mention these for the purpose of showing that the bones are not exempt from disease, any more than other structures; yet it does not always follow that a lack of the phosphate of lime in cow's milk is a sure sign of diseased bones. Reader, we do not like the term "_bone disorder_:" it does not throw the least light on the nature of the malady; it savors too much of "_horn ail_," "_tail ail_"--terms which only apply to symptoms. We are told also that, in this disease, "_the bones threaten to cave in--have wasted away_." If they do threaten to cave in, the best way we know of to give them an outward direction is, to promote the healthy secretions and excretions by a well-regulated diet, and to stimulate the digestive organs to healthy action. If the bones "have wasted away," we should like to have a few of them in our collection of morbid anatomy. That the bones should waste away, and be capable of assuming their original shape simply by feeding bone meal, is something never dreamt of in our philosophy.[30] Besides, if the cows get well, (we are told they do,) then we must infer that the bones possess the properties of sudden expansion and contraction, similar to those of the muscles. It may be well for us to observe, that not only the bones, but all parts of animal organization, expand and contract in an imperceptible manner. Thus, up to the period of puberty, all parts expand: old age comes on, and with it a gradual wasting and collapse. This is a natural result--one of the uncompromising laws of nature, over which human agency (bone meal included) has not the least control. If the bones are diseased, it results either from impaired digestion or a disproportion between the