544 



Malaria 



entomologic forceps, touching the pins only. Every in- 

 sect thus mounted should have placed upon the pin, at the 

 junction of the middle and lower thirds, a small bit of card or 



Fig. 184. Method of withdrawing the digestive tube of the mosquito 

 for study (Blanchard). 



paper, telling where and when and under what circumstances 

 it was taken. 



The dissection of fresh mosquitoes for determining whether 

 or not they are infected with malarial organisms must be 

 made with the aid of needles mounted in handles. The 

 position of the stomach, intestines, and the salivary glands, 



Fig. 185.- 



-Method of withdrawing the salivary glands of the mosquito 

 for study (Blanchard). 



and the mode of pulling the insect apart to show them can be 

 learned from the diagram. The organs thus withdrawn and 

 separated from the unnecessary tissue can be fixed to a slide 

 with Meyer's glycerin-albumin or other albuminous matter, 

 and then stained like a blood-smear, but should be cleared 



