98 PROCEEDINGS OF THE ACADEMY OF [March, 



The optimum soil reaction of this species is probably between 

 subacid and minimacid; the tests made on it in New England, indi- 

 cated by o's, led to the same value. 



Pyrola secunda L. 



Habitat. — Dry and occasionally moist upland peat. 



Acidity. — 



5+ X 



4 X 



3 ' o 



2 o 



1 X o 



300 100 30 10 3 1 



The optimum soil reaction of this species is inferred, from con- 

 sideration of the data from both New England and the present 

 region, to be subacid. The most acid reaction tabulated was ob- 

 served in sandy upland peat in southern Delaware. 



Chimaphila maculata (L.) Pursh. 

 Habitat. — Dry upland peat. 



Acidity. — • 



30 10 3 1 



The optimum soil reaction of this species is subacid. The most 

 acid reaction was observed in sandy upland peat in southern Dela- 

 ware. The least acid was noted in upland peat on glacial drift 

 overlying limestone in the Lehigh Valley west of Allentown, Penn- 

 sylvania, and in upland peat over limestone at Natural Bridge, 

 Virginia. 



The optimun soil reaction of this species is subacid. The most 

 acid reaction was observed in sandy upland peat in southern Dela- 

 ware. 



