In 1884 Dr. Gustav Jaeger, a German professor of Zoology 
and Physiology at the University of Stuttgart 
developed 'scientific' theories about the use of hygienic 
dress and of wearing wool, next to the body. He published 
his essays on health culture as Dr. Jaeger's Sanitary 
Woollen System. He wanted everyone to use wool fibres 
throughout the house right down to the bed sheets. He 
thought pure animal fibres would prevent the retention of 
noxious exhalations of the body.