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THE PHYSICAL AND CHEMICAL
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absorbed absorption actinotherapy action of light amperage amperes Angstrom units application artificial radiation artificial sunlight atomic system auto-intoxication blood body calcium carbon arc lamps cause cells CHAPTER chemical cholesterol chronic clinical colour cure degree disease distance dose eczema effect electric current electro-magnetic electrons employed erythema ether ether waves flow given glands heliotherapy improvement inches increase indicated infection infra-red radiation infra-red rays instances intensity irradiated irritation known lesions light rays light treatment light waves melanin ment mercury vapour lamp metabolism method minutes months necessary normal occurs operator organism oxygen patient potential practice produced proton provoked quartz radiant energy radiant heat reaction region resistance rheumatic rickets sensitisation shorter skin stimulation student substance supplied surface temperature tion tissues treated tungsten twice weekly ulceration ultra ultra-violet radiation ultra-violet rays usually violet radiation visible light visible spectrum vitamin voltage water-cooled lamp wavelength wire X-rays