460 
IOWA ACADEMY OF SCIENCE Vol. XXIV, 1917 
The roots appeared to be normal. All other plants and checks 
seemed healthy. On March 20, all the living plants possessed no 
visible symptoms of chlorosis. The chlorotic leaves had withered 
and died after living about two weeks. But one case was noticed 
where new leaves seemed to contract the disease from the chlor- 
otic leaves or stem below. Each leaf that appeared possessed 
less of the disease until finally it showed only in the midrib. 
A more intensive field study on a more extensive scale will 
be made this year to ascertain how prevalent this disease is and 
its economic status, if any. 
Conclusions seemingly warranted : 
1. Corn embryos may be chlorotic. 
2. Chlorosis in corn plants may not be transferred to other 
corn plants by contact or by sap. 
3. When corn plantlets are entirely chlorotic, they will not 
mature. 
