IOWA ACADEMY OF SCIENCES. 
63 
Ostrya virginica Willd. Ironwood. Not uncommon along 
the Nodaway, and may be found on Middle river, but not 
abundantly. 
Cratcegus coccinea L. Hawthorn. White thorn. Red haw. 
Common on low land, usually in larger timber. 
C. tomentosa L. Black haw. Not very common. Found in 
greater abundance on the west than on the east side of the 
county. 
Pyrus coronaria L. Crab apple. Very common on all low 
land, whether open or covered by larger timber. 
Corniis jmnicidata 'Li''E.eY . Dogwood. Common in thickets, 
both in valleys and on the higher land. 
Rims glabra L. Sumac. Common in thickets along the side 
and crest of river bluffs and on the high prairie. Found 
usually with hazel and bur oak. 
SambuGus canadensis L. Elderberry. Common in thickets 
on all waste, rich land. Prefers the bottoms. 
Prunus virginiana L. Chokecherry. Fairly common on all 
low land. Usually found in hick ts of other timber. 
Corylus americana Walt. Hazel. Very common on all rough, 
rolling land, especially near the larger streams. Very seldom 
found on low land. Originally a great part of the prairie was 
cove t ed with hazel, but most of it has been removed. A good 
deal yet remains, however, and all along the larger streams it 
is very abundant. 
Salix nigra Marshall. Willow. Tolerably common on all 
low, moist ground. 
Vitis oestivalis L. Wild grape. Common in all timber. 
Lonicera parviflora Lam. Not common. Found occasionally 
in heavy thickets. 
EFFECTS OF A SLEET STORM ON TIMBER. 
BY JAMES E. GOW. 
On the nig at of the 9 th and the morning of the 10th of Feb- 
ruary, 1898, a heavy sleet storm passed over Adair county, 
Iowa. The storm began not very long after midnight w th a 
brisk rain which froze as it fell and adhered tenaciously to 
trees and other objects with which it came in contact. The 
