26 Popular Science Monthly 



How Scientists Capture Mosquitoes When making a catch, the trap end 

 Alive for Experiment and Study of the . tube . is Placed over the resting 



mosquito, which in attempting to escape 



OCCASIONALLY it 

 is necessary to do 

 something else with a 

 mosquito besides swat- 

 ting it out of existence. 

 In order to study the 

 best methods of annihi- 

 lating it, scientists, 

 health officials and en- 

 tomologists find it neces- 

 sary to classify the 

 insect, dissect it and 

 experiment with it. For 

 these purposes it is nec- 

 essary to collect the mos- 

 quitoes without crushing 

 them. 



A collecting tube of any 

 size may be used, but 

 the one most approved 

 is a glass or celluloid 

 tube about five inches 

 long and one inch in 



selects the only way out, 

 toward the light. This 

 leads through the glass 

 cone into the large col- 

 lecting tube. The aver- 

 age time required for a 

 catch is about three 

 seconds. When the col- 

 lection is made for lab- 

 oratory use, not more 

 than ten specimens 

 should be taken in the 

 tube at one time, lest 

 the captives injure one 

 another. 



Above is shown a collector 

 using the mosquito trap to 

 catch live specimens. At 

 left is the tube, natural size 



A Japanese Invents a 

 Curling Iron 



KANJI TANAKA, a 

 Japanese residing 

 in Seattle, Washington, 

 has invented a curling 

 iron, which is designed 

 to make the hair-curling 

 operation not only easier 

 but more expeditiously 

 performed. With it the 

 hair may be curled and 

 the iron taken out without the usual un- 

 wrapping process. This is supposed to 

 leave the curl in better form. 



By pressing a kind of button the curl- 

 ing is done almost automatically. By 

 another pressure the parts are unlocked 

 so that they can be slipped out separately. 

 Another advantage which Mr. Tanaka 

 claims for his curling iron is that only one 

 hand is required for the operation. 



diameter. When in use one end of this 

 tube is closed with a cork stopper and 

 the other with a specially designed trap, 

 the invention of Dr. T. H. D. Griffiths, 

 of the Public Health Service, of New 

 Orleans, La. 



The trap consists of a cork stopper to fit 

 the tube. Into this a one-half inch 

 central opening is bored to accom 

 modate a small somewhat taper- 

 ing glass tube, the outer end of 

 which is one-half inch in diam- 

 eter, diminishing to three- 

 eighths inch in diameter at the 

 opposite, or inner end. 



This curling iron 

 is in two parts 

 so that it can be 

 slipped out of 

 the curl in sep- 

 arate sections 



Sliding nut to 

 rotate worm gear 



Spring 



