Show POISONS ON FRUIT arsenical substances applied to trees tree leave no dad bad results I 1 because of scares about the use ot of 1 arsenical poisons on fruits t to of destroy noxious insects the iho natch flatch experiment station determined to ascertain thi the precise amount adhering to fruits and selected two lots of grapes of ten pounds each one from vines sprayed with tile tho bordeaux mixture throughout the season 0 and which was very badly disfigured and the other from vines that wore were treated with the bordeaux mixture up to the middle of june then with two applications of tho the am mon monia lacal eal carbonate of copper and which acro 0 not in tho the least disfigured an analysis of the two samples was laadt at the state experiment station in tho the first there was found only 2 of 1 per cent of oxide of copper an amount so small that ono one would need to cat from halt half a ton to a ton of these grapes stems skins sides and an all to obtain the least injurious effect and that notwithstanding tho the fact that the bunches were selected from those havin having the largest amount of the copper mixture adhering to them in ili the second sample not a trace of copper could bo be found it would icem from the above that evert even under the most car careless cless use of tho the copper solutions t no injurious effects need be feared and that when pr properly provell overl r applied there win will not be a trace of copper left upon the fruit at harvesting to determine tho the amount of copper and arsenic adhering to tho the surface of I 1 apples appl e S which had been sprayed three times with tile tho bordeaux mixture aud and paris green 20 apples measuring ono one peck were taken to the state experiment station for analysis tho The amount of copper found on thase apples was about 5 of nn an ounce to a barrel the specimens selected for this analysis were those with the roughest surface to which would adhere more of the copper solution of pa pans pais is green than to average apples not a trace of f I 1 arsenic could be detected in this analysis I 1 tile the paris green average samples of paris green contain about 33 parts of 0 aido ijo of copper and 61 parts of arseal oil oils oxide was not used alter after july 1 but it was probably all washed off dw dur ilife t the tic three months following before tho apples were gathered about 0 october eto 1 orange judd farmer |