curled dock, smooth dock, buckhorn, or ribbed plantain, wild parsnip, horse nettle, velvet weed or button weed and burdock.

The Canada thistle, quack grass, horse nettle, cocklebur, and squirrel-tail grass are the most injurious in Iowa, while Dr. Halsted gives some of the worst weeds found in the state of New Jersey as follows: Canada thistle, wild carrot, docks, ox-eye daisy, ragweed, sorrel and narrow plantain.

In Wisconsin the worst weeds are quack grass, Canada thistle, mustard, dock, ragweed, wild carrot in some places, and cocklebur. The worst weeds for Indiana, according to Mr. J. R. Campbell, are white weed in clover and timothy meadows, cocklebur in corn fields, horse nettle, buckhorn, and in the southern part of the state wild garlic, while in Kentucky the star of Bethlehem has become a most pestiferous weed in gardens and fields. In parts of Canada, especially the province of Manitoba, they consider the Canada thistle, perennial sow thistle, wild oats, and marsh elder to be the most troublesome of their weeds. H. L. Bolley, in his account of the weeds of North Dakota, gives the following as some of the most troublesome: Kinghead, Canada thistle, French weed, mustard, and wild oats. Dr. Millspaugh reports the oxeye daisy, yarrow, broom sedge, and blue thistle as the worst weeds in the northeastern part of West Virginia. The broom sedge here listed is generally a troublesome weed in many parts of Virginia and other southern states, where it is considered one of the worst of weeds, as it is also so considered in Ohio by Professor Selby. Dr. A. Nelson considers Russian thistle, squirrel-tail grass, cockle, Canada thistle, bull thistle, buffalo bur, prickly lettuce, among the worst weeds of Wyoming.