26 N. J. Mosquito Extermination Association 



In the same year LePrince and Orenstein's book on "Mosquito 

 Control in Panama" was published, which is an excellent account of 

 just how- the wonderful results were reached. 



In 191 6 DiPache published an extensive article on the question 

 of malaria and excavations and other earthworks, taking the subject 

 up bibliographically and mentioning instances from the engineering 

 works from the time of the Pharaohs in Egypt to buildings in 

 Messina in 1912. 



In 1918 Priestly confirmed the observations of other experiment- 

 ers in concluding that vaporizing ^ to ^ ounce of cresyl per i^ 

 cubic yards of room space destroys adult mosquitoes and has the 

 advantage over sulphur dioxide that no injury is done to the room 

 or its contents. 



In 1918 Thibault announced that a fine powder made of dried 

 weeds and grasses blown over the surface of the water was ex- 

 tremely effective for a few minutes. When thoroughly wet it loses 

 its effectiveness. There is perhaps something very practical in this 

 series of experiments, which were made for the Bureau of Entomo- 

 logy. 



In 1918 Howlett found that at Pusa, India, the eggs of certain 

 mosquitoes (two species of Stegomyia, so-called) are laid more 

 freely in dilute solutions of sodium citrate and sodium tartrate than 

 ill pure water ; indicating the practical use of traps. This is one of 

 the few of the very numerous experiments with chemotropism with 

 mosquitoes, that have had practical results. 



In 1 91 8 Mann and Ebert suggested that oil-soaked sawdust pro- 

 vides a suitable method for securing an equal distribution of oil on 

 stagnant waters. 



In 1919 Feytaud and Gendre recorded the finding of a very large 

 number of mosquito larvae, including Anopheles, in the water heavily 

 tainted with sludge from a melinite factory in France, an observation 

 similar to one which was reported by Doctor Headlee, I think, at one 

 of the recent meetings of this association. 



It is very likely that in this summary I have omitted important 

 observations and operations, but I am sure that to an organization 

 so vitally interested in mosquito fighting as is the New Jersey Mos- 

 quito Extermination Association what I have brought together will 

 be of interest. You will have noted by mental comparison that your 

 own work in this state in many respects blazes the way for the 

 whole civilized world — that you are really the most advanced mos- 



