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136 



The Weekly Florists^ Review* 



June 8, 1906. 



in lacking acetic acid; in other words, it 

 is the simple arsenite of copper. It , is 

 a much finer powder than Paris green, 

 and therefore more easily kept in suspen- 

 sion, and has the additional advantage of 

 costing only about half as much per 

 pound. : When properly washed and pre- 

 pared by the manufacturers it is no more 

 harmful to foliage than Paris green when 

 the latter is brought to an equal fineness, 

 is quicber in effect, and should supplant 

 the latter as an insecticide. It is used 

 in the same way and at about the same 

 strength, as Paris green and London pur- 

 ple. 



Arsenite of lime, following substan- 

 tially tlie Kedzie formula, is prepared by 

 the aia of soda as follows : White arse- 

 nic, one pound; sal soda crystals, four 

 pounds; water, one gallon. BoU the 

 arsenic and sal soda in the water for 

 twenty minutes, or until dissolved. Add 

 enough water to make up for the, loss by 

 evaporation. This stock mixture will 

 keep indefinitely. For ordinary spraying 

 operations add one pint of the stock mix- 

 ture to forty gallons of water, in which 

 has been previously mixed about three 

 pounds of freshly slaked lime. Chemi- 

 cally, this arsenical is arsenite of lime. 

 The soda is used to hasten the process 

 and to insure the combination of all the 

 arsenic with the lime. The greatest care 

 should be exercised in preparing the 

 stock mixture, and afterwards in keep- 

 ing it plainly labeled to prevent its being 

 mistaken for some other substance. In 

 actual practice the arsenite of lime has 

 proven as effective as the older arsenical 

 compounds. Its cost is very inconsider- 

 able, which, with its proven effectiveness, 

 is its chief recommendation. The objec- 

 tions to it are the necessity of handling 

 poisons in its home preparation and its 

 color. 



London purple is a waste product in 

 the manufacture of aniline dyes, and 

 contains a number of substances, chief of 

 which are white arsenic and lime. It is 

 not so effective as the green poisons, and 

 is much more apt to scald unless mixed 

 with lime. It comes as a very fine pow- 

 der, and is more easily kept in suspension 

 than Paris green. It costs about 10 

 cents a pound. 



Arsenate of lead is prepared by com- 

 bining, approximately, three parts of the 

 crystallized arsenate of soda with seven 

 parts of the crystallized acetate of lead 

 (white sugar of lead) in water. These 

 substances when pulverized unite readily 

 and form a white precipitate, which is 

 more easily kept suspended in water than 

 any of the other poisons. 



Arsenate of lead may be used at any 

 strength from three to fifteen pounds to 

 100 gallons of water without injury to 

 the foliage, and in this respect is much 

 safer on delicate plants than any other 

 arsenical. The combined weights of the 

 two ingredients are here meant rather 

 than of the resulting lead arsenate, 

 which will be somewhat less. Its use is 

 advised where excessive strengths are de- 

 sirable or with delicate plants where 

 scalding is otherwise liable to result. 

 With this insecticide there is an advan- 

 tage in using the freshly prepared and 

 wet mixture in that it gives a more filmy 

 and adhering coating to foliage, the same 

 fineness not being secured when it has 

 been dried and repulverized. 



In point of solubility and correspond- 

 ing danger of scalding the foliage these 

 arsenicals fall in the following order, 

 the least soluble first: Arsenate of lead, 

 arsenite of lime, Paris green, copper ar- 



John H. Dunlop. 



senite, and London purple. The differ- 

 ence between the first four is not great 

 in the particulars noted nor in point of 

 effectiveness against larvae or other in- 

 sects. London purple is ordinarily con- 

 siderably less effective. 



JOHN H. DUNLOP. 



The largest greenhouse establishment 

 in the Dominion of Canada, and one of 

 the largest in America, is that of John 

 H. Dunlop, of Toronto. As is the case 

 with all of the older establishments, this 

 one grew from a very small beginning, 

 slowly at first, keeping in step with the 

 development of the demand for green- 

 house products. Mr. Dunlop was born in 

 1855, in New York, but his family re- 

 moved to Toronto in the early 60 *s. The 

 boy was not content until he had roamed 

 a bit, but Jn 1875 he settled down in that 

 city. It was five or six years later that 

 he built his first greenhouse, the embryo 

 of the present enormous establishment. 

 It was added to year by year as space 

 was required, for the business grew 

 steadily, even faster than the normal de- 

 velopment of our industry, for Mr. Dun- 

 lop has always been a producer of that 

 grade of goods which causes the buyer 

 to seek the source of supply. An old phil- 

 osopher once said something to the effect 

 that if one sets up his dwelling in the 

 wilderness and produces a better article 

 than can be had elsewhere, the buyers 

 will beat a pathway to his door. Mr. 

 Dunlop has endeavored to act on that 

 line of reasoning. 



The early houses in this establishment 

 were of most crude construction but, as 



years have gone by, every nsw idea ha» 

 been given a trial and Mr. Dunlop ha» 

 said of his place that in no other estab- 

 lishment in America have so many styles 

 of greenhouses been built. He says that 

 his preference is for the modern, high, 

 light, connected houses but that it is his 

 experience that, given a good enough 

 grower, the stock will be all right what- 

 ever the style of greenhouse. 



Mr. Dunlop was a pionesr in the forc- 

 ing of lily of the valley in Csinada and 

 he has also led the way in the culture of 

 roses and carnations. Even in the face 

 of the tariff charge, Mr. Dunlop 's roses 

 steadily find their way to several of the 

 principal cities south of the great lakes. 



Mr. Dunlop has traveled widely in hi» 

 efforts to keep pace with the floriculture 

 procession and has visited most of the 

 well known establishments in the United 

 States. He is active in society matters 

 and was for a term president of the Ca- 

 nadian Horticultural Society. At the 

 last meeting of the Carnation Society he 

 was the spokesman for Canada in its in- 

 vitation for the society to cross the line, 

 as it has practicaly pledged itself to da 

 in 1907. 



Please stop our advertisement of 

 mums and geraniums; all sold. — A. Rel- 

 YEA & Son, Poughkeepsie, N. Y. 



Put a neat sign in your window : ' ' Fu- 

 neral or gift flowers delivered by tele- 

 graph anywhere in the United States. "^ 

 When you have taken an order refer to 

 the page of "Leading Ketail Florists" 

 in the Review and select a man to whom 

 to telegraph the order. You will flnd it 

 a very satisfactory source of business. 



