EXPERIMENT STATION BULLETINS. 219 



for use. The arsenic in this mixture is equivalent to four ounces of 

 paris-green." 



"The pot, jug, etc., must never be used for any other purpose after 

 using it for making this mixture." 



If an additional pound or two of lime be added to the mixture it will 

 help to make the application permanent and conspicuous without in any 

 way interfering with its effects. In using it the extra lime should be 

 tidded. 



WHITE ARSENIC AND LIMB. 



"U'hite arsenic is much cheaper than paris-green and just as effective. 

 The work of preparation is of course to be considered but the real reason 

 why the writer hesitates to recommend its use is because of the similarity 

 in appearance between arsenic, baking-powder, flour, etc. 



It may be prepared in the following manner: — In two gallons of water, 

 place two pounds of freshly slaked lime and one pound of arsenic. Boil 

 from one-half to three-fourths "of an hour. By this lime the arsenic will 

 have dissolved and united Avith the lime. When wanted for spraying, 

 dilute with water and lime. The above pound of arsenic will suffice for 

 four hundred gallons of water. In order to prevent the ''burning" of 

 the foliage, slake one pound of lime to every twenty gallons of water 

 used for diluting. The above is for apple trees. Potatoes will stand the 

 spray considerably stronger. 



ARSENATE OF LEAD. 



This poison, although not in general use throughout the couTitry, has 

 several advantages; it shows where it has been applied; it is light and 

 does not require such vigorous stirring as paris-green; and it does not 

 easily burn the foliage. To prepare it, dissolve four ounces of arsenate 

 of soda, and eleven ounces of acetate of lead, each in a gallon of water. 

 On mixing the two solutions together we shall get a milky precipitate, 

 which should be stirred into 100 gallons of water. It is now ready for 

 spraying. Of course, larger or smaller quantities may be made in the 

 same proportion, and if this preparation does not seem strong enough, 

 it may be applied much stronger with safety. 



Its action is slower than that of paris-green, but the fact that it does 

 not readily burn the foliage is an advantage when spraying various kinds 

 of delicate trees with one mixture. 



HELLEBORE. 



White hellebore is the powdered root of a plant. It kills both by con- 

 tact and as an internal poison. It may be applied either dry or in the 

 form of a liquid. When used drv it should be mixed with three or four 

 times its weight of flour or plaster and then dusted on the insects. 

 Applied wet, one pound should be mixed with twenty-five gallons of 

 water and this liquid applied as a spray. A convenient form of duster 

 is made as follows: A tin box like a pepper-box, holding a quart or less, 

 is fastened to a stick about six feet long by means of a screw running 

 through the bottom of the box into the stick. The cover of this box 

 should be finely perforated to allow the poison to come out very slowly 



