ipll 



BETTER FRUIT 



Page 10^ 



Something you should know about 

 Arsenate of Lead 



Fig. 1 



LL Arsenate of Lead 

 which meets with the 

 various Government require- 

 ments is not of the same kind. 

 There are two distinct forms 

 of Arsenate of Lead, and the 

 object of this advertisement is 

 to show to the grower the 

 difference betv/een these two 

 and enable him to make an 

 intelligent selection of the kind 

 best suited to his needs. 



Neutral Arsenate of Lead 

 is composed of arsenic and 

 lead and prepared in such a 

 manner that all the arsenic 

 is thoroughly combined with 

 lead. This material is very light in gravity, settles 

 very slowly in water, is fluffy and holds a large 

 amount of water and when sprayed on foliage clings 

 very tightly to it. On account of its fluffiness it has 

 great covering power, and because the arsenic is thor- 

 oughly combined with leaa 

 it does not change its com- 

 position on exposure to the 

 weather and so will not burn 

 the most delicate foliage. 



The second material is the 

 acid Arsenate of Lead, in 

 which only two-thirds of the 

 arsenic is combined with lead, 

 the other third being very 

 loosely combined so as to form 

 a precipitate which is insol- 

 uble in water first, but 

 which on exposure to the 

 weather begins to disinte- 

 grate and give free arsenic, 

 which will severely burn 

 tender foliage. This material 

 is much heavierin gravity, not 

 so fluffy, will not hold as much 

 water, settles much more 

 rapidly in a spray mixture, 

 and does not cover the area 

 of foliage so thoroughly on 

 account of its greater density. 

 Such a material is suitable for 



Fig. 2 



A TEST OF TWO DROPS 



Fig. 3 



Figs. 3 and 4 are micro-photographs 

 magnified 30 times of a drop from each 

 of these solutions stirred up and placed 

 on glass. F;[^. 3 shows that New 

 Process Arsenate of Lead covers a 

 given surface more thoroughly than 

 the acid material, leaving no spaces 

 between the particles. We also found 

 that when dry the acid solution rubbed 

 off the glass much easier, showing its 

 adhesive qualities were not so good. 



spraying forest or shade trees 

 where foliage injury is not 

 quite so important, but it is 

 not adapted for spraying deli- 

 cate fruit trees. 



The photographs in this 

 article illustrate the difference 

 in the two forms of Arsenate 

 of Lead: one is Sherwin- 

 Williams New Process Arsen- 

 ate of Lead, which is the 

 highest type of an absolutely 

 neutral, thoroughly combined 

 lead arsenate, and the other is 

 one of the typical brands of 

 acid Arsenate of Lead offered 

 in competition at a much 



lower price, which shows very clearly the defects 

 common to this form of Arsenate of Lead. 



In the illustration shown by Fig. 1 we have a 

 picture of these two forms of Arsenate of Lead 

 stirred up in water and allowed to settle for fifteen 

 minutes. The same quantity 

 of paste is used in each case 

 and diluted to the same total 

 volume with water. Fig. 2 

 shows them after they had 

 stood over night and settled 

 all they could. 



After thoroughly settling, 

 the bulk occupied by a given 

 quantity of S- W New Process 

 Arsenate of Lead is approxi- 

 mately 45 cubic centimeters, 

 whereas the competitive ma- 

 terial, in the acid form, is 20 

 cubic centimeters, showing 

 two and one -quarter times 

 the bulk for New Process 

 Arsenate of Lead. 



The facts given above 

 plainly show the inadvisability 

 of the orchardist using the 

 cheaper grades on ttte delicate 

 foliage of his fruit trees. 

 There's no need to take 

 chances. Use the best. 



Fig. 4 



For the Horticulturist and the Fruit Grower there isn't a better spray than Sherwin- 

 Williams New Process Arsenate of Lead. Send for prices on your Spring requirements. 



AProfitablolnyGstniGni 



The Sherwin-Williams Co. 4. 



MANUFACTURERS OF HIGHEST GRADE INSECTICIDES AND 

 FUNGICIDES 



MAIN OFFICE---707 CANAL ROAD, CLEVELAND, OHIO 



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