VI AMERICAN TRANSLATOR'S 



where tliey arc known to exist in the human 

 body, is not the least embarrassment of the 

 ph^ sician's occupation. 



If you shall be able in all these instances 

 to surmount this uncertainty, or to cure the 

 patient, you Avill be more fortunate than your 

 predecessors. 



That this work will materially aid you in 

 such an attempt, I cannot doubt. 



For twenty years I have been seeking 

 information relative to human worms, but 

 have never before found, in any single publi- 

 cation, what is at all suited to satisfy a medi- 

 cal inquirer whose purpose is to keep pace 

 with the progression of his art. For though 

 we have a number of good papers and com- 

 munications on tliis branch of medicine, 

 there is no systematic treatise on this subject 

 in the English language. 



In our country, tliis chasm has been sen- 

 sibly felt and much regretted. 



I contemplate the work of Professor Bre- 

 ra as well calculated to supply this deficien- 

 cy, and so far as I know, it is the only 

 one, accessible to us, that has any claim to be 

 so considered. 



If it should not contain all we need, it is 



