July 19, 1919 



HORTICULTURE 



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For All Flowers in Season Call on 



THE LEO NIESSEN CO. 



1201 Race St. Philadelphia, Pa. 



EDWARD REID 



WHOLESALE FLORIST 



1(19 - 21 Ruftetd St., PkiUfclptia, Pt. 



CHOICE BEAUTIES, ORCHIDS, VALLEY, ROUS 

 mi all Siasorabk Variitiu if Cut Flaws 



Wired Toothpicks 



W. J. COWEE, Berlin, N. Y. 



itjoot *iju m .«•«... »s.t* »»m»4. tr»» 



GEORGE B. HART 



WHOLESALE FLORIST 



24 Stone St., Rochester, N. Y. 



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I BOSTON FLORAL ! 

 SUPPLY CO. 



WHOLESALE FLORISTS 



DEALERS IN 



| Guf Flowers & Evergreens ( 



Manufacturers, Exporters and 



Importers, Preservers of Cycas 



| Office, Salesrooms and Shipping Dept. | 



1 IS OTIS ST. and 96 ARCH ST. 1 



BOSTON. MASS. 



Phone, Main 2574-3525 



| Unknown customers kindly give refer- | 



ence or cash with order 

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I. HYMOFF 



Dealer in 



TWINE OF ALL KINDS 



Seconds and Cotton Shoe Twine 



260 Devonshire Street BOSTON, MASS 



When Writing to 



Advertisers Please 



Mention 



HORTICULTURE 



J. A. BUDLONG 



184 North Wabash Avenu*, CHICAGO 



Wholesale Growers of Gut Flowers 



ROSES, CARNATIONS 



AND ALL OTHER SEASONABLE STOCK 



Shipping order* have most careful attention always 



IF You Want Anything from Boston Get It 

 From Henry M. Robinson & Co. 



For Safety Place Your Order* With U* 



HENRY IN/1. ROBINSON & CO. 

 2 Wlnthrop Squars and 32 Otis Street, BOSTON, MASS. 



CYPRESS GREENHOUSE STOCK 



PECKY CYPRESS STOCK 

 HOT BED SASH 



Ask for Circular D and Prices 



THE A. T. STEARNS LUMBER COMPANY 



NEPONSET, BOSTON 



HYDROCYANIC ACID GAS IN 

 GREENHOUSES. 



The use of hydrocyanic acid gas for 

 white fly or black aphis in green- 

 houses has become common, but all 

 growers do not know how to handle 

 the gas in the right way. William 

 Hunt of Guelph, Ont, has outlined the 

 whole process as follows: 



Quantity of material required for 

 every one thousand cubic feet of space 

 to be fumigated for a general collec- 

 tion of greenhouse plants and tender 

 plants: 



% oz. Potassium cyanide by weight. 



V2 oz. Sulphuric acid by measure. 



1 oz. Water by measure. 



Bulk cyanide (not flaked cyanide) 

 98 per cent pure should be used. Keep 

 the cyanide in an air-tight glass jar 

 labelled "Poison," as the cyanide it 

 self and the fumes are deadly in their 

 nature to all animate life. 



The proper quantity of cyanide 

 should be pounded up fine just before 

 using. The sulphuric acid is also dan- 

 gerous to handle, being of a very burn- 

 ing nature. 



Directions for Using. 



1. Close all ventilators and make 

 the house as tight as possible. Fumi- 

 gate after dark or in dull weather, 

 never in bright sunlight. The plants 

 should be fairly dry. No watering or 

 spraying should be done on the day 

 the plants are to be fumigated. The 

 temperature of the house must not be 

 above 60 degrees Pahr. Choose a 

 dull, still night when there is very 

 little wind. 



2. Remove from the house any 

 plants of Piles microphylla (Artillery 

 Plant), Tradescantia zebrine (Striped 

 Wandering Jew), as the fumes injure 

 these plants badly. Fragrant-leaved 

 geraniums are also sometimes slightly 

 injured, but as the white fly attacks 

 these extensively, it is best not to re- 

 move them from the house. Any very 

 young seedling plants had also better 

 be removed. 



3. Use old gem jars or open 

 glazed earthenware jars. Metal or tin- 

 glazed jars should not be used. One 

 jar for every twenty feet in length for 

 a house 15 to 20 feet wide should be 

 used. 



4. When ready to start fumigation, 

 put into small paper bags the proper 



