Chemical afid Physical Papers. 195 



Sedge— Cyperus esculentus L. (?) 



Willow leaves— Salix longifolia Muhl. (?) 



Osage orange— Madura pomifera (Raf.) Schneider. 



Annual ragweed— Ambrosia trifida L. 



Green foxtail— Setaria viridis (L.) Beauv. 



Fetid marigold— Dysodia papposa (Vent.) Hitch. 



Dandelion— Taraxacum officinale Weber. 



Coral berry— Symphoricarpos orbiculatus Moench. 



Thistle— Circium discolor (Muhl.) Spreng. 



Iron weed— Vernonia baldwinii Torr. 

 *Mare's tail— Erigeron canadensis L. 



Vervain— Verbena stricta Vent. 

 *Agrimony— Agrimonia parviflora Ait. (?) 



Triple-awned grass— Aristida oligantha Mx. 



Nimble Will grass— Muhlenborgia schreberi J. F. Gmel. 



Horse nettle— Solanum carolinense L. 

 *Croton weed— Croton capitatus Mx. 



Mullein— Verbascum thapsus L. 



Lobelia— Lobelia syphilitica L. . 



Mallow— Sida spinosa L. 

 *Goldenrod— SoHdago tenuifolia Fursh. 



Dogwood— Cornus asperifolia Ms. 



Mountain mint— Pyenanthemum flexuosum (Walt.) B. S. P. 



Frog fruit— Lippia lancelolata Mx. 



White clover— Trifolium repens L. 



Blue grass— Poa pratensis L. 



Crab grass— Digitaria sanguinalis L. Scop. 

 *Elder— Sambucus canadensis L. 



Some of these were abundant, others were found only in small 

 quantities. Those marked * were collected in sufficient quantities 

 so that the ash could be examined. Others, which were found 

 afterwards to contain barium salts, were collected in the vicinity 

 of Lawrence in sufficient quantity for analysis. The plants col- 

 lected locally were as follows: 



Indigo— Baptisia leucantha T. & G. 

 Hedge— Madura pomifera (Raf.) Schneider. 

 Ragweed— Ambrosia artemisiae folia L. 

 Horseweed— Ambrosia trifida L. 

 Ironweed— Vernonia baldwinii Torr. 

 Erigeron— Canadensis L. 

 Yellow dock— Rumex crispus L. 

 Wild lettuce— Sonchus asper (L.) Hill. 

 Corn— (white field). 



* Large samples taken. 



