OF WASHINGTON, VOLUME XIII, 1911. 73 



ranged apparatus to aid the collector in selecting from the 

 multitude of specimens that come to light such specimens as 

 he may wish to save. 



It consists of a cloth base, perhaps a yard square, and a cone 

 of cheesecloth or other light fabric of about 30 inches base and 

 perhaps of equal height, sewed onto the base, the center of 

 which is then cut out. The apex of the cone is supported by 

 a stake in the ground, and the cloth base is pegged out tight 

 with the light inside the cone. Insects coming from all direc- 

 tions crawl about unable to reach the light itself, soon coming 

 to rest on the cloth of the cone, and are easily secured. 



The light used is an acetylene mine lamp of simple, durable 

 construction, giving a very intense light from its one- half or 

 three-quarters inch-burner, and with this naked flame it was 

 found expedient to use one of the so-called "fireproofing" 

 treatments on the cloth of the cone. Very few experiments 

 have been made on the relative attraction of portable lights, 

 and it is probable that some other equally available illuminaut 

 may have more attractive value. But Mr. Schwarz reports 

 that a portable acetylene lamp was tested in western Texas in 

 1907 and worked admirably, except that the form of the 

 glass globe surrounding the light was such that many speci- 

 mens were captured with difficulty. With a naked flame he 

 also collected successfully at Cayamas, Cuba, but many speci- 

 mens flew through the flame and were singed. 



The bulk of the device, packed, is very little in excess of 

 the lamp used; the cloth cone rolling up no larger than an or- 

 dinary napkin. Stakes can be found anywhere, but four 

 large wire nails for corner pegs seem enough handier to war- 

 rant their addition to the outfit. 



Insects are not always the only things attracted; toads have 

 several times been found, after a short absence from the light, 

 to be taking advantage of the aggregation of Lachiiosterna, 

 etc., about the base of the cone, sometimes even jumping for 

 insects several inches up the sides. 



The accompanjnng plate shows the arrangement by day- 

 light as well as its appearance while in use at night. The 

 small view illustrates the window method, which has proven 

 so very effective where a house in the country is available. 



Mr. Knab spoke of the results of Dr. Neiva's researches in 

 malaria and of his demonstration of the production of a race 

 of malarial parasites resistant to quinine. His work was done 

 on the river Xerem, when water-works to supply the city of 



