92 THE MOSQUITO 



animal belonging to^the lowest grade of Pro- 

 tozoa, and is allied to the Gregarines. Malaria 

 was formerly common in England ; it was then 

 known as ague. It is now extinct in this 

 country, but is common in Southern Europe 

 and the Tropics, where it causes disastrous 

 sickness and many deaths. The foregoing 

 particulars have been obtained from the de- 

 scriptive matter accompanying the models in 

 the glass case. 



In the illustration (Fig. 24) the common 

 window-gnat (Gulex pipiens) is shown. The 

 original photo-micrograph has an amplification 

 of 15 diameters; the focal length was 45 

 inches ; the time of exposure was half a 

 minute ; and the objective used was the 3 inch. 

 In the next illustration (Fig. 25) * the dan- 

 gerous mosquito (Anopheles maculipennis) is 

 represented with its proboscis extended. The 

 original photo-micrograph shows an amplifica- 

 tion of 21 diameters ; the focal distance was 

 82 inches ; and the objective used was the 

 3J inch. 

 * From a micro-slide supplied by Messrs. E. <& J. Beck. 



