Physicotherapeutics in recent years has made wonderful progress through the discovery of new agents, and dermatology more than any other branch of medicine has profited thereby. It comprehends phototherapy, Finsen, photochromotherapy, radium therapy, high-frequency current, fulguration and roentgenotherapy which deserves a great place in medicine. Nobody would or could diminish the value of the great services rendered to medicine by the application of the x-rays. They are firmly established as a therapeutic factor of the greatest power.
It is undeniable that the x-rays have certain chemical properties, which in their early applications and even to-day in the hands of inexperienced practitioners resulted injuriously and in some cases really disastrously. Nearly every one who had to do with x-ray applications suffered some alterations of the skin, hair and nails, which they were compelled to nurse for years, if indeed they have ever healed up. This prompted the use