PREFACE. 



in a great variety of occupations, in a light, for which, the mind 

 of the country may scarcely be prepared. They seem to call 

 for early legislative interference and prevention. 



The Author takes the opportunity of claiming priority in 

 the discovery of micro-organisms, in living tissues. His delinea- 

 tion of which a drawing is given of the Einderpest germ 

 was published in 1865, the next earliest being that of the 

 Spirillum of relapsing fever by Obermeier. 



14 CHARLOTTE SQUARE, 

 EDINBURGH, November 1883. 



