The reader may now, perhaps, expect that I shall introduce a series of practical deductions from the foregoing facts and observations; but such is not my object upon the present occasion. I merely wish to call the attention of practitioners and the public to the subject of these pages, and shall thus discharge, as I conceive, an imperative duty to society. Having mentioned what I am induced to consider a frequent cause of inflammation of the investing membranes of the brain in children, my undertaking is completed. The Profession does not require, and the public would not be benefited, by the addition of lengthened therapeutical rules; for I am convinced, there is not a greater imposition to be found than the doctrine that non-medical persons can treat diseases with success by means of popular systems of medicine, '_practical_' treatises, &c. Such books have often done irreparable mischief--certainly much more harm than good; and so far from injuring the profits of medical practitioners (as some appear to suppose), have greatly added to the number of their patients. I avail myself also of this opportunity to enter my protest against the ill-judged and mischievous practice of those patients who confide upon many occasions in the opinion of their nurse, rather than that of their medical attendant, and who, in consequence, often injure themselves essentially by deceiving the latter. With respect to this mistaken preference, Dr. Dewes has well observed--'Let it not be hastily assumed that there is more safety in following the directions of a nurse than those of the physician, because she may have had some experience; for it must be quickly perceived that the calculation is much in favour of the latter, since the nurse can attend but twelve patients per annum, while the physician may visit many hundreds in the same period--besides, his knowledge of the laws of the human system gives him a very decided superiority.' In conclusion, it is right to observe, that protracted suckling being a custom much more prevalent among females of the lower orders than those of a superior rank, it must follow as a necessary consequence, that _Meningitis, and other disorders resulting from this cause, are proportionably less frequent in private than in public practice_. This remark, it is evident, should be remembered, in order to obviate apparent discrepancies which otherwise might appear irreconcilable with the opinions I have expressed. In the truth of those opinions I feel the most perfect confidence, and cannot but hope that their promulgation will hereafter prove extensively beneficial, since precautionary, and even therapeutical measures may be founded upon them, which, if uniformly adopted, will not only prevent much ill-health and suffering to mothers, but will also afford the means of saving many children from perishing by one of the most painful and fatal diseases to which they are subject. POSTSCRIPT.