Lange: REVEGETATION OF TRESTLE ISLAND. 629 
lanceolata. It has occupied nearly one third of the section 
and next summer, I think, the thistle will keep the cows off the 
grass, and as the West section is a willow island, the East sec- 
tion will be a thistle island. 
During September, 1900, there was over 5 inches of rain and 
now water once more surrounds the East section and the cows 
have not been there since about October Ist. 
The West Section in the Season of 1900.—The lake has risen 
about two feet since September 15th this year and the south 
half of the section is under water. Fire and cattle have thus 
far never invaded this section. The willows are thriving. There 
are probably five species of them, but Salw amygdaloides 
forms the thicket. There are a few thrifty cottonwoods, and 
aspens, one balsam poplar, and one slippery elm, U/mus fulva. 
Although sumac, hazel, box-elder, silver maple, wild haw, 
flowering dogwood and three species of oak grow within half 
a mile and most of them within a stone’s throw of the island, 
not one individual of all these has been found on either section 
of Trestle island. 
Last spring several of the willow species, when they were 
only about 24 months old, bloomed for the first time and pro- 
duced fruit. A count on May 11th revealed 38 staminate indi- 
viduals and 27 pistillate individuals of Salix amygdaloides in 
flower. The count was then made to include older trees of 
the same species along the cycle path near the island and of a 
total of 135 trees counted 74 bore male and 61 bore female 
flowers. Although a number of the trees were measured last 
year, only a few recent measurements of October 12, 1900, 
can be given here. 
Diameter at 4 Height Growth of this 
Number. _ inches abovethe measured along season 
ground. the stem. i 
1. Salix amgydaloides. | 3 inches | 15 ft. 2 in. Ff es, ate: 
2. Salix amygdaloides. | 3 “ | 16 ft. Io in. Uncertain. 
3. Salix amygdaloides, | 2% “ Pa Ter tt. 7 ft. 3% in. 
4. Populus deltoides. | 1 | 14ft.3%in. | 6 ft. 9% in. 
5. Populus deltoides. To ie Calne | 15 ft. 9 in. 6 ft. 6 in. 
6. Populus tremuloides. | 1 ee LOMta jin 4 ft. 2 in. 
7. Ulmus fulva. lle erage ss 4ft.8in. | 2ft. gin. 
There are many willows on this section of the size of those 
measured, while the two cottonwoods and the aspen measured 
are the largest that could be found and the elm is the only indi- 
vidual present. The average size of the large vigorous Salzx 
