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IOWA ACADEMY OF SCIENCE Vol. XXIY, 1917 
nated. The fact that so few of the acorns of the red oak covered 
with a little earth grew leads us to believe that germination, is 
low in nature, except in very favorable seasons and conditions, at 
least so far as the red oak and other Iowa forms are concerned. 
In some years a considerable portion of the acorn crop is injured 
by species of Curculio. 
White oak ( Quercits alba L.). The large acorns of the white 
oak occur abundantly and in nature may often be found ger- 
Fig. 58. — Young stem of white oak. Planted on October 8. 1, condition 
on October 25. 2, condition on October 31. 3 and 4, scales and young leaves. 
The leaves dropped off early in January. 5, condition in March. Drawn 
by C. M. King. 
of this species were gathered on September 25 and planted on 
September 27 in the laboratory. They were kept moist in 
sphagnum mess. Another batch was planted in the greenhouse 
in sandy loam and kept moist with sphagnum. In a few days 
the acorns in both cases split at the apical end and sent out 
urinating soon after they have fallen. A number of fresh acorns 
