PLATE II.-Hordeum jubatum L.-A tuft of the grass as it usually grows.

NOTE-Plates I and II we are able to present through the courtesy of Professor Crandall of the Colorado Agricultural College. They are from his bulletin on Colorado Weeds.

PLATE III.-Sheep jaws. Fig. 1-Normal condition. Fig. 2-As enlarged and ulcerated by "Squirrel-tail" hay.

Fig. 2.

Fig. 1.

PLATE IV. Sheep jaws, side view. Fig. 1-Normal condition. Fig. 2--Distorted jaws, ulcerated cavities packed with the broken awns. Fig. 3-Another jaw, the awns removed, showing its deep ulcerated cavities.

Fig. 1.

Fig. 2.

Fig. 3.