56 



CAPT. LL. LLOYD. 



Table XII, and in Diagram 1. In the diagram the points represent the percentages 

 of the tasting flies which remained to drink. The bottom dotted line represents 

 formaldehyde and water, and shows that any mixture of these is deterrent as com.- 

 pared to the water control, of which an average of 82 per cent, of the tasting flies 

 drank. The 10 per cent, formaldehyde deterred from drinking nearly 82 per cent. 

 (67 out of 82) of the tasting flies which would hav^e drunk had there been no formalde- 



Table XII. 

 Showing the Deterrence of Formaldehyde, and its Remedy. 







No.Oj 



Total 



No. of flies 



No 



of 1 



[lies 



Percent 

 drinkiUj 

 ' tasting 



. of 

 y 1o 

 flies 







tests 



flies 



tasting 



di 



•in king- 



Solution 











Av 













Av 



Max 



Min 



Max i Min 



Av Max 



^Min 



Water controls 





8 



263 



33 48 26 



27 



35 



20 



82 95 



72 



,, formaldehyde 



10% 



6 



221 



37 46 39 



5 



13 



1 



15 ; 34 



2 



f» " 



'^•5% 



6 



190 



32 35 27 



7 



13 







16 1 38 



(' 



99 99 



5-0% 



6 



195 



32 ' 38 ! 26 



14 



19 



9 



43 ' 59 



24 



»> " 



2-5% 



6 



221 



35 ! 48 I 26 



22 



27 



15 



60 



73 



52 



>> " 



2-0% 



4 



148 



39 63 ! 24 



21 



33 



13 



59 



71 



5L' 



>> " 



1-5% 



4 



151 



38 47 j 29 



26 



34 



19 



70 i 80 



64 



f > " 



1-0% 



2 



75 



37 



38 ! 37 



28 



31 



26 



75 i 81 



70 



>» " 



•5% 



2 



74 



37 38 1 36 



1 ! 



30 



31 



30 



82 83 



81 



Lime watei controls 



50% 



3 



112 



37 1 39 35 



30 



31 



29 



80 86 



72 



formaldehyde 



10% 



4 



136 



34 i 42 25 



5 



11 



9 



29 36 



24 



, > " 



7-5% 



4 



121 



30 40 i 23 



16 



21 



11 



53 71 



40 



>> »> 



5-0% 



4 



122 



30 33 



28 



16 



21 



11 



54 1 67 



37 



>5 >» 



2-5% 



4 



114 



28 31 



26 



21 



23 



17 



73 1 85 



54 



»• 99 



2-0% 



2 



64 



32 ! 33 



31 



23 



25 



21 



72 1 76 



68 



,9 >> 



1-5% 



2 



70 



35 1 39 



31 



23 



27 



20 



66 i 69 



1 



64 



Water, sugar controls 



5% 



1 



45 



45 1 





40 







89 





„ formaldehyde 



10% 



2 



76 



38 45 



31 



14 



21 



8 



36 i 46 



26 



99 " 



7-5% 



2 



63 



31 I 36 27 



17 



23 



11 



52 1 63 



41 



». " 



5-0% 



2 



71 



35 38 1 33 



22 



23 



21 



62 I 69 



55 



'7 



99 99 



2-5% 



2 



66 



33 35 31 



28 



31 



26 



86 88 



84 



Xiime water 



50%) 







i 















sugar 



2-.-5%i 





















,, formaldehyde 



10% 



2 



60 



30 30 



30 



14 



14 



14 



47 47 



47 



99 99 



7-5% 



2 . 



72 



36 1 41 



31 



24 



29 



20 



68 71 



65 



99 '9 



5-0% 



2 ' 



60 



30 \ 35 



25 



23 



27 



20 



78 80 



77 



99 99 



2-5% 



2 



52 



26 27 



25 



22 



24 



21 



86 89 



84 



Temp. av. 77° F. (78-9-76-0°). Rel. humid, av. 50% (58-39%). 



hyde present, and so on. The line of dashes represents the percentages which 

 drank the formaldehyde in 50 per cent, lime water. It is higher than the previous 

 one because, while the deterrent influence of the formaldehyde remains as before, 

 that of the formic acid is removed. It also is always below the water and lime water 

 controls. The next line of dots and dashes represents formaldehyde and 5 per cent, 

 sugar, without lime water. The presence of the bait has partly counteracted the 



