CAUSTIC SODA OR SODIUM HYDROXIDE: This chemical is especially 

 useful in destroying poisonous plants on waste ground or places where 

 vegetation is negligible for a season. It may be used with good effect on 

 poison ivy, spreading dogbane, and similar deeply rooted weeds. A 

 5-per cent solution, or one pound caustic soda to two gallons of water, is 

 sufficiently strong for ordinary purposes. All other vegetation will be 

 checked until this chemical is washed out of the soil. 



IRON SULPHATE OR COPPERAS : Copperas is comparatively inexpensive 

 and may be used on poisonous plants which may be growing among grain, 

 grass, or pea crops. It will do no harm to these crops, but cannot be used 

 where beans are planted. Clover and alfalfa plants are blackened by it, 

 but they will quickly recover if the solution has not been too strong. The 

 usual solution is obtained by dissolving 100 pounds copperas in 52 gallons 

 of water, which quantity is sufficient for one acre of herbage. 



COPPER SULPHATE OR BLUESTONE: Bluestone is more expensive, but 

 a far less quantity will serve the same purpose. From 8 to 12 pounds is 

 sufficient for 52 gallons of water. Both copperas and bluestone spraying 

 should be done in clear, hot weather, when rain is not expected for at least 

 twenty-four hours. 



The following list, in each case, does not include all the plants that 

 are poisonous to the different animals, but only those through which most 

 loss has been suffered. 



HORSES: Ergot, bracken, horsetail, darnel, purple cockle, locoweed, 

 water hemlock. 



CATTLE: Ergot, bracken, darnel, purple cockle, cursed crowfoot, 

 larkspur, locoweed, poison hemlock, water hemlock, water parsnip, laurel, 

 white snakeroot, ragwort. 



SHEEP : Ergot, darnel, death camas, purple cockle, pasque flower, 

 lupine, locoweed, poison hemlock, water hemlock, laurel, white snakeroot. 



SWINE: Darnel, purple cockle, water hemlock. 



POULTRY: Ergot, darnel, purple cockle, and other injurious seeds in 

 screenings. 



