28 



CONCLUSIONS. 



From but one season's observations at a single quarantine station 

 we can not assume to draw any hard and fast conclusions regarding 

 the probability of Stegomyia, infected or not, being carried by vessels. 

 Nevertheless, I think we may conclude, first, that mosquitoes can come 

 aboard vessels under favorable conditions when the vessel is not over 

 15 miles from shore; second, that Stegomyia can be carried from 

 Mexican or West Indian ports to those of our Gulf States; third, that 

 they can board a vessel lying at anchor a half mile or less from shore, 

 being conveyed by the open lighters used or flying aboard, and finally, 

 that a vessel moored a short distance from land may become infected 

 with yellow fever, our old beliefs to the contrary notwithstanding. 



1 wish to acknowledge the aid of Assistant Surgeons Burkhalter" 

 and Bbersole in collecting data and specimens. 



