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Obstructives and sceptics are in one sense benefactors: although they do not generally originate improved modes of thought and action, they at least prevent the adoption of crude theories and ill-digested measures. To meet the criticism of these opponents, inventive genius must more carefully bring its ideas and plans to the test of practical experiment and thorough investigation; and as truth must ultimately prevail, it cannot be considered unjust or injurious to insist upon its presenting its credentials. This is, we submit, one of the benefits resulting from schools, colleges, and guilds: it is difficult to impress them with novel truths; but in a great degree they act as breakwaters to the waves of error. In no department of social life is this doctrine better illustrated than in the medical profession, which is among the keenest and most sceptical of bodies in scrutinising novelty; but it has rarely allowed any real improvement to remain permanently untested and unadopted. We believe this to be the fair view to take of a class of scientific men who have certainly had a large share of sarcasm to endure.

General readers, for whom we profess to cater, take no great interest in medical subjects and discussions; but as historians of what is doing in the world of art, science, and literature, we think it our duty to record, in a brief way, any information we can collect that may be beneficial to the suffering portion of humanity; and in this 'miserable world' it is most probable that one-fourth part of our readers are invalids. Why should they not have their little troubles, whims, and maladies studied and cared for? The disease which gives a title to this short notice is perhaps one of the most mysterious and vexatious to which our nature is liable; both its cause and cure are equally occult, and its modus operandi is scarcely intelligible. A contemporary thus playfully alludes to the subject in terms more funny than precise:—'What is neuralgia? A nervous spasm, the cause of which has, however, not been satisfactorily and conclusively demonstrated; but we may, perhaps, obtain a clearer view of its nature, if we look upon it as connected with "morbid nutrition." Every one knows that the system is, or ought to be, constantly subject to a law of waste and repair; and if the operation of this law is impeded by "cold," "mental excitement," or any other baneful condition, diseases more or less unpleasant must ensue. The vis naturÆ uses certain particles of matter in forming nerves; others in forming membrane, bones, juices, &c.; while used-up particles are expelled altogether from the system. We can readily conceive that each order of atoms is used by a distinct function, and has a different mission; and any morbid perversion or mingling of their separate destinies must end in disorder and suffering—nature's violent endeavour to restore the regularity of her operations. A cough is simply an effort of the lungs or bronchiÆ to remove some offending intruder that ought to be doing duty elsewhere; and may we not call neuralgia a cough of a nerve to get rid of a disagreeable oppression—nature's legitimate coup d'État to put down and transport those "red socialist" particles that would interfere with the regularity of its constitution? Let us fancy, for a moment, a delicate little army of atoms marching obediently along, to form new nerve in place of the substance that is wasting away: another little army of carbonaceous particles have just received orders to pack up their luggage and be off, to make way for the advancing nerve-battalion; but in their exodus they are met by a fierce destroyer, in the shape of an east wind—a Caffre that suddenly throws the ranks of General Carbon into disorder, and drives them back upon the brilliant and pugnacious array of General Nerve: a battle-royal is the result. General Nerve immediately places lance in rest, and advances to the charge with the unsparing war-cry of: "Mr Ferguson, you don't lodge here!" and if Caffre East-wind is not despised and trifled with, he is generally beaten for a time; but great are the sufferings of humanity—the scene of this encounter—while the fight is raging.'

Now comes the question: How to get rid of this cruel invader? Dr Downing has undertaken to give an answer, which we believe to be satisfactory. In addition to the proper medical and hygienic treatment, which is carefully and ably stated in the work before us, Dr Downing has invented an apparatus which appears to be very efficacious; and we will therefore allow him to describe it in his own words:—'From considering tic douloureux as often a local disease, depending on a state of excessive irritability, sensibility, or spasm of a particular nerve, and from reflecting upon its causes, and observing the effect of topical sedatives, I was led to the conclusion, that the most direct way of quieting this state was by the application of warmth and sedative vapour to the part, so as to soothe the nerves, and calm them into regular action. For this purpose, I devised an apparatus which answers the purpose sufficiently well. It is a kind of fumigating instrument, in which dried herbs are burned, and the heated vapour directed to any part of the body. It is extremely simple in construction, and consists essentially of three parts with their media of connection—a cylinder for igniting the vegetable matter, bellows for maintaining a current of air through the burning material, and tubes and cones for directing and concentrating the stream of vapour. The chief medicinal effects I have noticed in the use of this instrument are those of a sedative character; but its remedial influence is not alone confined to the use of certain herbs. A considerable power is attributable to the warm current or intense heat generated. When the vegetable matter is ignited, and a current of air is made to pass through the burning mass, a small or great degree of heat can be produced at pleasure. Thus, when the hand is gently pressed upon the bellows, a mild, warm stream of vapour is poured forth which may act as a douche to irritable parts; but by strongly and rapidly compressing the same receptacle, the fire within the cylinder is urged like that of a smith's forge, and the blast becomes intensely hot and burning.'

Those who wish to know more of this mode of treatment, had better refer to the work itself. We must content ourselves with having simply drawn our readers' attention to it.