28o TiMEHRl. 



educated eye far more clear and reliable evidences of 

 their presence. Of these the most familiar examples 

 are the various kinds of lice (Pediculi capitis, Pediculi 

 vestimentty &c.J — the itch-inse6l (Sarcoptes scabieiy or 

 AcarusJ — and peculiar to certain tropical countries and 

 very well-known to British Guiana, the Chigoe or Jigger 

 (Pulex penetrans). 



The Parasites of the Vegetable Kingdom may likewise 

 be sub-divided into Entophyta and Epiphyta— and 

 are included under the general term of Fungi, the Ento- 

 phyta being such as inhabit the alimentary canal and 

 internal tissues of the body, and the Epiphyta those 

 which afEe6l the skin and subcutaneous tissues. 



Familiar examples of the Entophyta are the thrush- 

 fungus (Oidium albicans) the fungus that produces the 

 disease called Thrush — the Sarcina ventriculi often met 

 with in the stomach, the yeast-plant (Torula cerevisisej 

 also met with in the stomach — and the cotton-fungus 

 Chionyphe carteri) inhabiting the deep tissues and bones 

 in the feet and hands in the disease called Mycetoma or 

 the Fungus-foot of India. 



Amongst the Epiphyta are included the various fungi 

 with long names (Trichophyton, Microsporon, &'c.) 

 which are associated with the skin diseases described as 

 " ringworm." 



The third great class (the parasites of extremely 

 minute organic forms) includes those extremely interest- 

 ing and exceedingly minute organisms grouped under 

 the general term Ba6leria, about which so much is being 

 written nowadays, and to whose presence Pathologists 

 have now to look for the fundamental causes of many 

 diseases. " This third form of parasitism is constantly 



