practice in the capital, and, as a national recompense, a pension for life of 6000 francs, has in his own house 26 sets of apparatus, for all of which he finds employment; and similar establishments, public and private, are daily multiplying throughout France. "Struck with the great advantages of this remedy, I have established an institution for its exhibition, after having obtained the consent of the Imperial Government of Lower Austria, who have inspected the situation and the plan. I have devoted four chambers, containing two sets of apparatus, one for females, and the other for males, provided with proper attendants for each sex. The number of chambers, and the extent of the apparatus, will be increased according to its success. In order to be the more secure, and to avoid the difficulties inseparable from an imitation, I have procured the apparatus from Paris, constructed under the direction of Dr. Galès. "The employment of the fumigation will never be left to the discretion of the patient; and no one will be admitted until he has consulted me, either alone, or in concert with other medical men, 66 Wishing to facilitate beyond the capital, and in foreign countries, the adoption of this remedy, I shall always have, according to the example of Dr. Galès, sets of apparatus, made under my own eye, for those who require them; and these will be accompanied with small explanatory models, capable of being taken to pieces, in order to point out exactly the disposition of the different parts." DE CARRO, M.D. (Signed) Through the medium of your Annals, I beg leave to inquire whether a smooth wheel of variable radius, or what mechanicians term an expanding rigger, has ever been applied to any machine, in connexion with a centrifugal regulator, for the purpose of equalizing the velocity of the working part of the machine when the driving power is subject to sudden and considerable variation? An answer to this inquiry, by any of your readers possessing the requisite information, will be esteemed a favour, by, Sir, your obliged and obedient servant, Brimscomb, Aug. 15. A. M. What description of stone is that which is commonly employed for constructing flour mill-stones, called French burs? Each millstone is formed of several burs, hewn into shape, and cemented together. They are also hooped with iron. A pair of stones of this kind, which are considered the best in use, cost upwards of 201. Have we no stones equally fit for the purpose in England? Churn Cottage. S. WEBB. The French bur-stone is a kind of vesicular quartz, found in the formations round Paris. No stone answering the purposes of a mill-stone so well has ever been found in Britain. Tolerable millstones are made in Scotland from green-stone.-T. Perhaps you may think the following notice deserving a place in a less perishable record than the one from which it is extracted:"We hear from Canterbury that on Friday last, about noon, a large ball of fire was seen to pass over that city, which was followed by a storm that broke almost all the windows in the town; and the next morning three suns appeared in the sky, attended with a rainbow inverted, which lasted from nine till twelve, to the great astonishment of the inhabitants." (The Cirencester Flying Post, Dec. 28, 1741, No. 54.) A. M. If not inconsistent with your plan, I request, in behalf of several chemical students, that you will do us the favour to insert in a number of the Annals a table of chemical equivalents, for the purpose of laying them on slide-rules. Stating what you consider the most accurate numbers would render a reference to the authorities unnecessary. 7. In the new edition of my System of Chemistry, which will be published in a few weeks, I have been at considerable pains to determine the weights of the atoms of bodies according to the best data at present in the possession of chemists. I refer my Correspondent to that work for the table which he desires to have.-T. XV. On impregnating Water with Carbonic Acid by the Syringe of Mr. Brooke's Blow-pipe. SIR, (To Dr. Thomson.) It appears to me that the condensing syringe of Mr. Brooke's blow-pipe may be applied with advantage to the purpose of impregnating water with carbonic acid. A (Plate LXXII. Fig. 6) represents an urn to contain the B, the condensing syringe. C, a silk bag to contain water. the gas. D, a funnel, furnished with a stop-cock, to replenish the urn with water. When fresh water is to be introduced, the syringe is to be removed, and the silk bag connected with the stop-cock, E, in order that the expelled gas may not be lost. When the gas is to be introduced, the syringe may be screwed on to either of the stop-cocks, E or F, as may be found most convenient. If the idea has sufficient novelty to find a place in your Journal, by inserting it you will oblige your humble servant, XVI. Lectures.. T. GLOVER. Dr. Marcet proposes to give a Course of Clinical Lectures at Guy's Hospital during the next winter. And Mr. Bell will give a Course of Lectures on the Treatment and Diseases of the Teeth. Mr. T. J. Pettigrew, F.L.S. Surgeon Extraordinary to their Royal Highnesses the Dukes of Kent and Sussex, will commence his Winter Course of Lectures on Anatomy, Physiology, and Pathology, on Friday, Oct. 17, at eight o'clock in the evening precisely. The Lectures will be continued every succeeding Wednesday and Friday, at the same hour, until completed. Mr. Guthrie, Deputy Inspector of Military Hospitals, will commence his Autumn Course of Lectures on Surgery on Monday, Oct. 6, at eight in the evening, in the Waiting Room of the Royal Westminster Infirmary for Diseases of the Eye, Mary-le-bonestreet, Piccadilly. Mr. Clarke will begin his Lectures on Midwifery, and the Diseases of Women and Children, on Friday, Oct. 10, at No. 10, Saville-row, Burlington Gardens. Mr. Gaulter will deliver in the ensuing season two Courses of Lectures on the Physiology of the Human Body, at No. 10, Frithstreet, Soho-square. The Lectures will be given on Monday and Thursday evenings, at a quarter past eight o'clock, after the Surgical Lectures are concluded. The Introductory Lecture of the First Course will be on Thursday, Oct. 9. The following arrangements have been made for Lectures at the Surry Institution during the ensuing season: 1. On Ethics; by the Rev. W. B. Collyer, D.D. F.S.A. To commence on Tuesday, Nov. 4, at seven o'clock in the evening precisely, and to be continued on each succeeding Tuesday. 2. On Chemistry; by James Lowe Wheeler, Esq. To commence on Friday, Nov. 7, and to be continued on each succeeding Friday. 3. On the British Poets, from Chaucer to Cowper, by Wm. Hazlitt, Esq. To commence early in January, 1818. 4. On Music; by W. Crotch, Mus. D. Professor of Music in the University of Oxford. To commerce early in February,, 1818. |