drawn up from the most authentic Ancient Chroniclers, and including important Facts now first published. Second edition, with coloured plate of K. Alfred's Jewel, 8vo., new cloth, 6s. (pub. at 12s.) G. Willis, 1854.

The most valuable and authentic Life of Alfred the Great. Included are Alfred's Will, in Saxon, with translation the Treaty between Alfred and Guthrum in Saxon; Fulke's Letter to Alfred, Alfred's Preface to Gregory's Pastoral Care, in Saxon, with a translation; a Chronological Summary of Anglo-Saxon History, &c.

HUME'S (DR. A.) THE LEARNED SOCIETIES and PRINTING CLUBS of the United Kingdom; being an Account of their respective Origin, History, Objects, and Constitution, with a SUPPLEMENT containing all the recently established Societies and Printing Clubs, and complete Lists of their Publications to the Present Time, by A. I. EVANS, post 8vo., new cloth, 5s. G. Willis, 1853.

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RAYNOUARD, LEXIQUE ROMAN, ou Dictionaire de al Langue des Troubadours, comparée avec les autres Langues de l'Europe Latine, 6 large vols. royal 8vo., sewed, 2l. 10s. Paris, 1844.

This excellent and extensive work is preceded by "Nouvelles Recherches Historiques et Philologiques, un Résumé de la Grammaire Romance, un nouveau choix des Poesies originales des Troubadours, et Extraits de Poemes divers," &c.

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LONDON, SATURDAY, MAY 6, 1854

Notes.

AN ENCYCLOPÆDIA OF VENTILATION.

"The House [of Commons] met to-day [27th April] after the Easter holidays—and honourable members, on entering, seemed highly to appreciate the unusual luxury of a little fresh air."—The Times, 28th April.

The failure of some late attempts to ventilate public buildings invites me to set forth an Encyclopædia of ventilation—at a cheap rate, and in a compendious form.

Aware of the abilities and celebrity of many of the writers on this subject—from Whitehurst and Franklin to Reid and Gurney—I must ward off the imputation of self-conceit by expressing my belief that the errors of those who have failed should be chiefly ascribed to excessive cleverness; to unadvised attempts at outwitting nature! I hope to escape that snare. In the execution of my humble task, I shall entirely rely on common sense and common experience.

Air is essential to human life, and as respiration destroys its vital qualities, the ventilation of rooms which are intended for habitation should be a primary object in all architectural plans.

Architects, however, seldom provide for the ventilation of rooms otherwise than as they provide for the admission of light. Now the properties of light and air, with reference to our domestic requirements, differ in some important particulars—of which it may not be amiss to give a brief enumeration.

Light moves with uniform velocity: air is sometimes quiescent, and sometimes moves at the rate of thirty miles an hour. Light diffuses itself with much uniformity: air passes in a current from the point of its entrance to that of its exit. Light, whatever be its velocity, has no sensible effect on the human frame: air, in the shape of a partial current, is both offensive to the feelings and productive of serious diseases. Light, once admitted, supplies our wants till nightfall: air requires to be replaced at very short intervals. Light may be conveniently admitted from above: air requires to be admitted on the level of the sitter. Light, by the aid of ground glass, may be modified permanently: air requires to be variously adjusted according to its direction, its velocity, the seasons, the time of the day, the number of persons assembled, &c.

An attentive consideration of the above circumstances leads me to certain conclusions which I shall now state aphoristically, and proceed to describe in more detail.

A room designed for a numerous assemblage of persons—as a reading-room, a lecture-room, or a school-room—should be provided with apertures, adapted to admit spontaneous supplies of fresh air, in such variable quantities as may be required, on at least two of its opposite sides, and within three feet from the floor; also, with apertures in the ceiling, or on a level therewith, to promote the exit of the vitiated air. The apertures of both descriptions may be quite distinct from those which admit light.

Suppose a room to be twenty-four feet square, and sixteen feet in height, with two apertures for light on each side, each aperture being three feet wide by eight feet in height, and