20S 
IOWA ACADEMY OF SCIENCES. 
Podosphcera oxijacanthoe (D. C.) DeBary. I have never seen 
this fungus absent on the cultivated cherry, and this season is 
no exception to the rule. It began to appear on the cultivated 
cherry in July and continued till October, although older trees 
were less affected than young trees in nursery. It was very 
abundant on young trees of Prunu^ pumila in the nursery. It 
also occurred to a limited extent on Prunus Americana. 
, Microsphoera Alni (D. C. ), Wint. Although occurring on Spring a 
vulgaris and S. persica, it did not disfigure the shrubs as usual. 
The same fungus also appeared on Lonicera, though less trouble- 
some than in 1893. 
Microsphoera quercinia (Schw. ), Burrill. Appeared on the Eng- 
lish oak, Quercus robor, in September, though not as abundant 
as in 1893. 
Uncinula necator (Schwh.), Burrill. Appeared to a 'limited 
extent on Roger hybrids late in September. 
Erijstphecommunis (Wallr.), Schl. Appeared in considerable 
quantities on Ranuaculus abortivus and R. lacustri^ at Mud 
Lake, Iowa, where Mr. Carver found the plants covered. 
Erisyphe ciclioracearum D. C. Was very abundant on Helianthus 
amiuus, H. tuberosus both cultivated and wild. Also on Ambro- 
sia artemisiasfolio and A. trejicla. It was less abundant on Ver- 
bena strictdc, V. hastata and V. Urticifolia than in 1893. 
COINCIDENCE OF PRESENT AND PREGLACIAL- 
DRAINAGE SYSTEM IN EXTREME SOUTH- 
EASTERN IOWA. 
BY FRANCIS M. FULTZ. 
[Abstract.] 
The drainage system in southeastern Iowa is believed to be 
practically the same today that it was in preglacial times. By 
southeastern Iowa reference is made to the counties of Louisa, 
Des Moines, Lee, and the eastern part of Henry. Present evi- 
dence shows that every stream of any importance is now occu- 
pying a preglacial bed. This applies to the Mississippi river 
