OUTPUT OF WASTE MATTER 143 



surface of the skin, and which are constantly 

 being shed from the surface in myriads, the 

 growth and development of all epidermic 

 appendages, such as hairs, nails, horn, feathers, 

 etc., remove certain matters from the blood 

 and alter its quality. We may indeed go 

 farther and say that the development and 

 growth of all tissues, as they depend on matters 

 taken from the blood, must alter that fluid 

 Thus we may understand that the abnormal 

 development of any tissue or organ must have 

 a similar effect, and in some such way the 

 nutrition of one organ must affect that of the 

 others. 



