162 
Wisconsin Academy of Sciences , Arts and Letters. 
as to the negative property that certain food elements demanded by the 
plants are absent; and whether such lines of adaptability do not frequently 
coincide with generic or family division lines. 
Note. — After the reading of this paper cases were cited by members 
present showing real exceptions to the rule suggested. Gaylusacia resinosa 
is found upon Trenton limestone three miles west of Hanover, Ind., on the 
high banks of the river. Both Gaylusacia and Vaccinium on hill tops of 
Lower Magnesian limestone in towns of Troy, Franklin and Spring Green, 
Sauk county, Wis., and other plants of this order, but the species were not 
named, in Lincoln county, Ky. In none of these cases, however, did it 
appear that the drainage from limestone would come to the plants; but 
still the soil must be calcareous. 
