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 

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

 drawing is given of the Einderpest germ 

 earliest being that of the 



