THE condition known as miliaria rubra, lichen tropicus,' or, to g•!ve it its popular and most descriptive synonym, prickly heat, .was lately recalled to my mind when turning out some old correspondence. I came across a letter from an Officer of the l/East Surrey Regiment, sent to me when we were stationed together in ' Hong Kong during 1926. This is what he wrote: " I have been abroad for six years and each summer' I have suffered agonies from :prickly heat. In all 1 have tried twenty-nine so-called cures,' recommended by various medical men; none of these did me. any good until I tried your preparation .. That was'last year and I was cured in four days. This year my prickly heat .returned and I tried YOtH' p'reparation again with the same marvellous effect."After re-reading this ietter, dated some fifteen years ago, it occurred to me that, as we hiwe thousands of men serving in the East at present, a few words 011 this subject puJ:?lished in the JOURNAL OF THE ROYAL ARMY MEDICAL CORPS might be of service. For the benefit of those who have 11'ot yet served abroad, and indeed those wl)o are now so serving• but have not yet had an opportunity of using this simple method of dealing with a most annoying . and painful condition, I will describe briefly its general characteristics.Symptoms and Signs.~ The appearance of a rash 'which when well established is accompanied by a burning sensation and intense itching.