12 



B.C. Entomological Society. 



(2.) I/ime-sulpluir 17.5 cc. 



ILO -182.5 cc. 



Ar-senate o£ lead, non- 

 acid ( C.S. Co. ) 2.4 gms. 



(3.) Lime-sulphiir 

 H.O 



Arsenate of 

 (C.S. Co.) 



. 17.5 cc. 

 .482.5 cc. 



(4.) Lime-sulphur 17.5 cc. 



Black Leaf 40, 1-1,000. .4S2.5 cc. 

 Arsenate of lead, acid 



(C.S. Co.) 2.4 gms. 



(5.) Lime-sulpluir 17..5cc. 



ILO 482.0 cc. 



Arsenate of lend, acid 



( Vreelands) 1.2 gms. 



(6.) Lime-sulphur 17.5 cc. 



Black Leaf 40, 1-1,000. .482.5 cc. 

 Arsenate of lead, acid 



(Vreelands) 1.2 gm: 



strength, except that it appears slightly 

 muddy or cloudy. The arsenate of lead settles 

 faster than the residue from the Black Leaf 

 40, and the latter settles on top of the first 

 in a floccnient blackish mass. 

 June 1st. Liquid colour of dilute lime-sulphur. 

 A considerable amount of free sulphur thrown 

 down. A strong smell of both Black Leaf 40 

 and lime-sulphur still present. 



May 29th. Combined the above materials to 

 get data on reaction and to find unsatisfac- 

 tory results if any be present. This solution 

 appears identical to that of Ex. (1), except 

 muddy colour. 



June 1st. Solution colour of dilute lime- 

 sulphur. A small amount of free sulphur 

 thrown down. 



May 29th. Combined the above materials to 

 get data on reactions ; also to note any visibU 

 effect of decomposition of the materials. The 

 arsenate of lead a white paste changed to a 

 black-grey colour and more residue is appar- 

 ent than in the case of the neutral arsenate. 

 The liquid or solution remains cloudy and 

 muddy after several hours' standing. A 

 decided difl'erence between the colour of the 

 residue in this solution and that of Exs. (1) 

 and (2) is apparent. The residue is blacker 

 in this solution. 



June Isit. lyiquid colour of dilute lime-sulpluir 

 in addition to a large amount of black pre- 

 cipitate. A small amount of free sulphur is 

 present. 



May 29th. Combined the materials in this 

 experiment to find the resultant reactions 

 and to get data on the effect of the different 

 materials. Everything is similar to Ex. (3). 

 except that the residue from the Black Leaf 

 40, which was not placed in Ex. (3), is slowly 

 settling on the arsenate of lead, which has 

 already settled to the bottom. When Black 

 Leaf 40 and lime-sulphur are combined, a fine 

 precipitate slowly settles out. The nature of 

 this is unknown to us at the present time. 



June 1st. Liquid colour of dilute lime-sulphur. 

 A considerable amount of a yellowish-black 

 precipitate has been thrown down in addition 

 to the dark-grey arsenate of lead residue. 

 This mixture seems to be a combination of 

 free sulphur and the lime-sulp'hur-f- nicotine- 

 sulphate residue. 



Jlay 29th. Combined the above materials to 

 get data on effects and also to note any appar- 

 ent decomposition. After settling for several 

 hours the solution differed very little from 

 a similar dilute solution of straight lime- 

 sulphur and water, except that there was a 

 slight cloudiness. The residue was a very 

 black-grey with minute particles of sulphur 

 scattered through it. 



June 1st. Liquid colour of dilute lime-sulphur. 

 A very small amount of free sulphur has been 

 thrown down on top of the black residue. 



May 29th. Combined above materials to get 

 data on effect of combination and to note any 

 decomposition of materials which might take 

 place. There is a difference of colour in the 



