What about modern concrete structures? Do they not represent a far greater hazard to health than buildings made of stone? If so, there are still some strong people around who, apparently, are not affected by living in concrete buildings. At least they are not aware of any disadvantages healthwise. Not everyone is so favourably endowed, however, and some people notice twinges of rheumatism and neuralgia after only a few weeks – a more accentuated stiffness of the limbs, or a stiff neck. The gouty nodes one may already have become more painful, perhaps even depression may set in, even if not experienced previously. If you notice these or other disturbances shortly after moving into a concrete building, you should experiment by spending a holiday with friends who live in a brick, wooden or stone building. If the symptoms disappear while you are there, it would be reasonable, in the interests of health and if you are able, to move from the concrete structure, despite its modern conveniences, to a healthier dwelling place.