74 MOKQUITOES AND MALARIA. 



lining it outwardly. They may be seen like minute pustules 

 from the inner surface. When one of these fertilised bodies is 

 pressed on a glass slide, myriads of so called germinal rods are 

 seen. These are seldom found free in the stomach of the 

 mosquito, but may be found in countless numbers in the 

 peculiar veneno-salivary glands connected with the proboscis. 

 These glands, two in number, consist of a number of plump, 

 clearly-defined cells, arranged along a branching duct ; in these 

 cells the germinal rods may be found in countless numbers, 

 and when the mosquito is feeding on human blood these rods, 

 which are really spores, are passed into the circulation and 

 give rise to the plasmodia. 



