Hitt: Novres ON MIGRATORY PLANTS 567 
These stations were in the southern part of Lake county, IIl., at Lake 
Zurich and near Barrington. Two considerable patches were seen 
in pastures and some examples by roadsides. Those found in 
pastures were the most instructive, and at Lake Zurich were care- 
fully examined, where the patch was of four or five square rods in 
extent. As the season had been very dry and the land chiefly 
used for dairying, the cows had cropped the pastures close, taking 
about everything edible. But the Grindedia seemed untouched and 
flourishing, and being in flower in early September made a fine 
display of golden yellow amid the parched surroundings. The 
grass which grew among it had been picked out and nibbled 
off close up to the stems. The only hint of service was apparently 
experimental, for some of the plants showed by their branching 
that the main stem had been taken off at an earlier stage of growth, 
and the most probable explanation was that the animal had tested 
something unfamiliar, and finding the gummy, bitter plant unpala- 
table afterward left it quite alone. If allowed to grow and ripen 
the seed, as some heads were already mature, a good crop would 
be furnished for the coming year. 
SISYMBRIUM ALTIssiMuM L. As this has been found more 
common in the vicinity of Jackson Park, the opinion has been ex- 
Pressed that it was introduced to this region at the time of the 
Columbian Exposition in 1893. But from other collectors I 
learn of its appearance in the vicinity of Chicago about 18go at 
least. It now occurs in various places, sometimes a tall branch- 
ing weed, as the name indicates, at others low, subglobose, widely 
branching, of a habit that suggests a good tumble weed. I have 
seen it chiefly in the latter form, but have not caught it discharg- 
ing the functions of a tumble weed, which the shape and rather 
stiff branches would enable it to do if detachable from the ground. 
Vast number of seeds are produced on these thickly set branches. 
Metirorus arpa Desv. The rest of the plants to be noticed 
are the troublesome kinds, some of long standing, others of more 
recent introduction. Among those whose behavior has most oe 
terested me is the white melilot, the sweet clover of our mothers 
gardens, For a dozen or more years I have seen no weed make 
-Sfeater progress in overrunning waste grounds. It seems strange 
that a plant I knew in childhood as a harmless garden-flower, a 
