The Mosquitoes of New Jersey i8i 



75 per cent dead in the 25-gm. solution. 

 10 per cent dead in the lo-gm. solution. 

 All alive in remaining solutions. 

 At 12:15 p. m., July 15, 1917, the jars were again examined with the fol- 

 lowing results : 



All dead, even pupae, in 25-gm. solution. 

 All larvae dead, 2 live pupae, in lo-gm. solution. 

 50 per cent dead in i-gm. solution. 

 15 per cent dead, many live pupae, in 0.5-gm. solution. 

 All alive or transformed to pupae in 0.25-gm. solution. 

 All alive in check. 

 On July 16, 1917, at 9:00 a. m., the jars were again examined, with the 

 following results : 



All dead in 25-gm. solution. 

 2 live pupae in lO-gm. solution. 



10 live larvae, many empty pupal shells and live pupae in i-gm. solution. 

 No increase in mortality in solutions of lower strength. 



Experiment 5 



OBJECT: To determine the minimum dosage of nitre cake for Aedes 

 sollicitaiis in saline water. 



Solutions of nitre cake in salt-marsh creek-water. 

 A series of jars were prepared as follows: 



)f nitre cake in 1,000 cc. of water testing 7 per cent salinity. 

 )f nitre cake in 1,000 cc. of water testing 7 per cent salinity. 1 



)f nitre cake in 1,000 cc. of water testing 7 per cent salinity. 

 )f nitre cake in 1,000 cc. of water testing 7 per cent salinity. 

 )f nitre cake in i,G00 cc. of water testing 7 per cent salinity. 

 )f nitre cake in 1,000 cc. of water testing 7 per cent salinity. 

 )f nitre cake in 1,000 cc. of water testing 7 per cent salinity. 

 No nitre cake in 1,000 cc. of water testing 7 per cent salinity. 

 At 5:30 p. m., August 3, 1917, 50 half-grown sollicitans were placed in each 

 jar. At 9:30 a. m., August 4, 1917, the jars were examined with the following 

 results : 



All alive in check solution. 

 All alive in 0.5-gm. solution. 

 All alive in i-gm. solution. 

 2 dead in 2-gm. solution. 

 50 per cent dead in 4-gm. solution. 

 All dead except one in 6-gm. solution. 

 All dead in 8-gm. solution. 

 All dead in lo-gm. solution. 

 At 10:30 a. m., August 6, 1917, the following results were noted: 

 25 per cent dead in 0.5-gm. solution. 

 50 per cent dead in i-gm. solution. 

 82 per cent dead in 2-gm. solution. 

 90 per cent dead in 4-gm. solution. 

 All dead in 6, 8 and lo-gm. solutions. 

 All alive in check. 



