458 



communicated the disease to the unfortunate doctor. These insects having 

 reached the term of their existence would have been unable to continue 

 propagating the disease. 



The case of the stone cutter may be accounted for by siipposing that at 

 the midday hours some of the contaminated insects while flying above the 

 deck of the Amu Murii had been blown away by some gust of wind towards 

 the water in the dock. In order to save themselves from drowning these 

 mosquitoes would rest upon any floating body in their way and being 

 drifted by the out flowing current towards the gate where the stone cutter 

 was working, inoculated him with the disease. The case of the Arequipa is 

 instructive as showing how the modified climatic conditions of that 

 vessel, while traveling towards the tropics enabled a focus to be established, 

 whereas at St. Nazaire it could not. According to my theory some of the 

 mosquitoes, free from contamination, must have passed from the Anne 

 Mu lit to the Arequipa, before the latter moved away from her side; they 

 communicated the disease from the mate to the next case that followed, 

 and a new brood of the same species having been developed during the 

 voyage some of them found their way to the patients and occasioned 

 subsequent invasions. 



