Fill the stopper nearly to the brim with water. 

 Cut a thin slice of cork and place it on the surface 

 of the water. Upon the cork place a piece of clean 

 white paper. The paper should not quite occupy 

 the whole of the space in the mouth of the stopper. 



I. Invert the chutney jar (prepared as above) 

 over the top of a jar in which some mosquitoes have 

 hatched. Remove the cardboard lid and gently tap 

 the glass. The mosquitoes will fly upwards into 

 the chutney jar. Place it upon its stopper prepared 

 as above. 



Fig. 35. Method of keeping Mosquitoes alive 



Place the whole, after labelling, in a dark cup- 

 board or other convenient place (incubator). 



At the end of the first day or so, the males will 

 be found dead upon the piece of paper, and can be 

 removed. On the second night after hatching, most 

 of the insects will feed, and the jar is ready for use. 



2. Place the inverted jar, prepared with card- 



