The Instrument which we have brought before the public, for preventing conception, depends for its virtue upon the electric fluid. The public are well acquainted with the common shock of an electrical apparatus; they are probably aware that many physiologists consider electricity analogous to the principle of life itself. They know that lightning is a display of the electric power—that it abounds in all nature, but not in equal intensity. They may possibly have heard of its efficacy in cases of Rheumatism, Palsy, and many other diseases—that its property is to stimulate, and, in excess, to kill. They may be familiar with the terms Magnetism, Galvanism, &c., but, in fact, they all are the effects of one cause, differing only in the intensity of their action, and their mode of development. What is now called electro-magnetism, or magnetic electricity, is merely electricity in a modified form; the result of its application is the same. The public may be told of the extraordinary powers possessed by this fluid in supporting partial life, when it is established in nervous communications. Digestion depends upon the uninterrupted nervous communication between the brain and the stomach; if that is destroyed, digestion ceases; but if electricity or galvanism be applied to the divided ends of the nervous channels, digestion proceeds as before, and for a very considerable time. Its usefulness, therefore, can be fully appreciated when applied through the instrumentality of the nerves, to those organs or structures, that are not sufficiently endued with vital influence. The many hindrances heretofore existing in the employment of electricity, as a preventive, owing to the circumstance of favourable weather being required for its exhibition, and it also being difficult and formidable in its application, are now obviated by the introduction of this instrument. The advantages are, that it can be used at any time, and under all circumstances. It is perfectly safe, and that it is certain, is attested by the fact, that of the large number already sold, not one has been returned, although the purchasers have had the liberty given them of doing so, should the instrument fail in effecting its object. CHAPTER X. CONCLUDING REMARKS. After the publication of Mr. Owen’s first edition of this work, several communications were received by him, approbatory of his book, some of which I think of sufficient importance to be introduced into this edition, inasmuch as they contain facts that are worthy of being treasured up in the recollection of all young married persons. In the one to which I now allude his correspondent remarks as follows: