One effect of the attention given to the condition of the workers in the factories has been, that ventilation has been extensively introduced, and with marked effects, on the condition of the workpeople. When I was at Glasgow a striking instance was pointed out to me of the beneficial effects of ventilation when applied to the dwellings of the working classes connected with such establishments. I was informed there was in that city an assemblage of dwellings for their workpeople, called, from its mode of construction and the crowd collected in it, the Barracks. This building contained 500 persons; every room contained one family. The consequences of this crowding of the apartments, which were badly ventilated, and the filth were, that fever was scarcely ever absent from the building. There were sometimes as many as seven cases in one day, and in the last two months of 1831 there were 57 cases in the building. All attempts to induce the inmates to ventilate their rooms were ineffectual, and the proprietors of the work, on the recommendation of Mr. Fleming, a surgeon of the district, fixed a simple tin tube of two inches in diameter, into the ceiling of each room, and these tubes led into one general tube, the extremity of which was inserted into the chimney of the factory furnace. By the perpetual draught thus produced upon the atmosphere of each room the inmates were compelled, whether they would or not, to breathe pure air. The effect was that, during the ensuing eight years, fever was scarcely known in the place. The process was apparently defective only in not providing for the appropriate warmth of the air introduced. The cost of remedies previously applied in the public hospitals to the fever cases, continually produced as described in the barracks, were stated by Dr. Cowan to have afforded a striking contrast to the cost of the means of prevention. Similar defective ventilation and overcrowding in rooms of work, with the addition of the deterioration of the air by the use of candles or gas-lamps at night-work, produce similar effects on the milliners and dressmakers employed at the larger workshops of the metropolis. In a return of the causes of death to the milliners and dressmakers who died during the year 1839, in the unions of the metropolis, in which we have no means of distinguishing those who worked separately or in small numbers, the results were as follows:— TABULAR STATEMENT of DEATHS from Disease of Milliners and Dressmakers, in the Metropolitan Unions during the year 1839, as shown by the Mortuary Registers.