103 



"■ PHINOTAS DISINFECTANT 5 PER CENT." 



The sample was reduced to the stock solution of 1 to 100, and a jar 

 with 500 cc of water was stocked with larvffi and pupte of Culex and 

 Anopheles. At 9.25 a. m. 1 added 5 cc of the stock solution. At 10.10 

 a. m. the Culex larvas were dead; at 10.30 the Anopheles began to die, 

 and all were dead^at 2 p. m. All pupa? were yet alive. Next morning 

 6 adults were found in the hood and 5 cc of the stock solution was 

 added, doubling the amount in the water. Yet twentj^-four hours 

 later several adults were again in the hood and all the pupae were 

 alive, seeming not in the least discommoded by the disinfectant. 



The difference between the action of the material on the larvtv and 

 on the pupa; is most remarkable and, once the pupal stage was reached, 

 development seemed not in the least interfered with. 



''PHINOTAS MARK (J." 



The sample was reduced to the stock solution of 1 to 100 and two 

 jars with 500 cc of water were stocked with larvre and pupt\? of A)io- 

 jjheles and Cide.i:-. At 4.30 p. m. 1 added 5 cc of the stock solution to 

 jar No. 1, and at 4.55 most Culex and some Anopheles larvae were 

 dead. At 5.30 all Anopheles were dead, but a few Culex larvae were 

 yet alive. Next day, at 8 a. m., a few pupa? remained alive; at 12 m. 

 everything was dead. 



To jar No. 2 I added 1(» cc of the' stock solution at 4.3(> p. m. At 

 4.50 all Culex larvae were dead; at 5.30 only pupa- remained alive; 

 next morning eveiything was dead. 



SOLUBLE BLAST FURNACE OIL. 



1 reduced the sample to the stock 1 to 100 mixture and stocked two 

 jars, each containing 500 cc of water, with larvae and pupse of Culex 

 and Anopheles. At 3.30 p. m. I added 5 cc of the stock to jar No. 1, 

 and in twenty minutes all Culex larvfB were dead. At 4.40 p. m. all 

 the larvte were dead, and though the pupa? were alive, the adults died 

 as they attempted to emerge. 



In jar No. 2 1 added 10 cc of the stock at 3.25 p. m. All larvae 

 were dead in live minutes; ))ut at 5.30 some pupa; were yet feebly 

 alive. 



Of the phinotas preparations nothing is equal in effectiveness to the 

 " phinotas oil." The other preparations mix fairly well with water, 

 form no surface scum, and all impart a milk}' tinge to the water. The 

 proportion where 5 cc of the stock was used is 1 to 10,000; where 10 

 cc was used is 1 to 5,000. 



