A small area of thatched roof supported on four pillars should be erected on the roof to protect the sleeper from dew, and to prevent his being worried by the glare of the moon, which to say the least of it makes it very difficult to sleep. Whether there is any truth in the belief that exposure to the moon’s rays may cause blindness or not, I cannot say, but I certainly have met with a number of cases of temporary blindness for which it was, to say the least of it, extremely difficult to find any plausible explanation other than the popular one. Moreover, as we are quite in the dark as to the _modus operandi_ of true sunstroke, it seems unscientific to deny that over-stimulation of the retina by the moon’s rays can be capable of producing the symptoms in question, and at any rate it is preferable to act on the assumption that “moon-blindness” may be a possible contingency. It is, further, a matter of great importance that the upper limits of the air-space included within a room should be ventilated by means of openings placed close up to the ceiling, as otherwise a stratum of impure, heated air will lodge there, which can only be removed by the slow action of diffusion. In one-storied houses this is usually effected by means of small windows, and in order to admit of a sufficient number of these being provided, it is a common expedient to carry the walls of rooms situated in the interior of the house above those of the lateral rooms, as shown in fig. 4. There should, however, be no necessity for doing this, as no room should be ever built with no external wall; and though upper openings on more sides than one may be desirable, this is not so essential as to warrant the large increase of cost involved in building in this way. Where a house has an upper storey, the top ventilation of the lower rooms is usually effected by openings into the verandahs; but this is by no means a satisfactory outlet, and it would be far preferable to effect the purpose by means of shafts carried up in the thickness of the walls to the roof, the long column of air within which would favour the production of a good current. In certain parts of the East, subterranean chambers (_taikhana_) are used as a refuge during periods of extreme heat, and are occasionally to be met with in very old European bungalows, though I have never seen one in actual use. Good examples are to be seen in the ruins of the historical Residency at Lucknow; and it was within them that many of the women and children were sheltered during the memorable siege. They can, of course, be ventilated only from above; but there can be no doubt that they are cooler than rooms above ground, and it is possible that the principle might be adopted with advantage under certain extreme climatic conditions.