For the fullest development of the prevalent system of treating the insane we must go to Colney Hatch and Hanwell, the two great lunatic asylums for the county of Middlesex. The former, situated on the Great Northern Railway, only six miles from the metropolis, is the largest and perhaps the most imposing-looking non-metropolitan building of the kind in Europe. In this establishment, built within the last six years, we may study the merits and demerits of modern asylums. Containing within its walls a population, inclusive of officers and attendants, of 1,380 persons, which is equal to that of our largest villages, and presenting the appearance of a town, its wards and passages amounting in the aggregate to the length of six miles, it is here that we shall find the completest system of organization, and, if we may use the term, of official routine. The enormous sum of money expended upon Colney Hatch, which has reached already to £270,000, prepares us for the almost palatial character of its elevation. Its _façade_, of nearly a third of a mile, is broken at intervals by Italian campaniles and cupolas; and the whole aspect of the exterior leads the visitor to expect an interior of commensurate pretensions. He no sooner crosses the threshold, however, than the scene changes. As he passes along the corridor, which runs from end to end of the building, he is oppressed with the gloom; the little light admitted by the loop-holed windows is absorbed by the inky asphalte paving, and, coupled with the low vaulting of the ceiling, gives a stifling feeling and a sense of detention as in a prison. The staircases scarcely equal those of a workhouse; plaster there is none, and a coat of paint or whitewash does not even conceal the rugged surface of the brickwork. In the wards a similar state of things exists: airy and spacious they are, without doubt; but of human interest they possess nothing. Upwards of a quarter of a million has been squandered principally upon the exterior of this building; but not a sixpence can be spared to adorn the walls within with picture, bust, or even the commonest cottage decoration. This is the vice which pervades the majority of county asylums lately erected. The visiting justices doubtless believe that it would be a superfluous and even mischievous refinement to trouble themselves about pleasing the eye or amusing the brain of the lunatic; but this is a mighty error, as every person knows who understands how keenly sensitive are the minds of the majority of the insane.