PHYSIOLOGICAL ACTION.—So far as I can determine, no specific toxic 
symptoms have been noted; under S, alba I have given the general action of 
mustard without differentiation. eee | nae . Se 
DESCRIPTION OF PLATE 24. 
1. End of a branch in fruit and flower, Binghamton, N. Y., July 5, 1883. 
2. Outline of one of the lower leaves, 
3- Fruit (enlarged). 
4. Pollen grains x 380, 
