134 THE PLANT WORLD. 



descends southward into New Jersey and Pennsylvania. It is reported 

 too as growing in the mountains of western Maryland, and news of its 

 occurrence, at greater altitudes, in Virginia and North Carolina, would 

 occasion no surprise. 



In Pennsylvania it is rare, and the only counties in which it has 

 hitherto been discovered and collected are: Wayne, Garher;. Susque- 

 hanna, Graves; Tioga, Garl>er'; Sullivan, C. E. Smith; Wyoming, 

 Thorp; Schuylkill, B isJioif ?LnA Huntingdon, Biichhnrt. 



The station in the last county is worthy of special notice. It lies 

 near Coleraine Forges, on Spruce Creek, a rapid stream that flows from 

 northeast to southwest along the base of Tussey's Mountain, which is 

 not a solitary peak or cone, but an elevated ridge many miles in length, 

 with steep, wooded sides. On its western flank there is another lower 

 ridge that runs parallel and coalesces with it and is broken at intervals 

 by narrow ravines. Into one of these ravines the disintegrated rock- 

 debris has washed down from above for ages, and forms a vast heap of 

 loose material, coarse and fine, saturated with moisture from the rains 

 and from the heaps of snow that accumulate and there melt late in 

 the spring. During severe winters the whole mass is frozen solid to a 

 considerable depth, and by digging ice has been obtained not far beneath 

 the surface as late as the middle of August. Over and around such a 

 spot the mean annual temperature must sink to a low figure, providing 

 thus a congenial home for the Linnaea, where it was discovered, with 

 several other northern plants, by Professor Buckhart, of the State 

 College of Agriculture, to whom I am indebted for specimens. The 

 elevation of the locality above sea level is 1,000 feet or more. 



NATURALIZED COMPOSIT.ffi. 

 By Frank Dobbin. 



IT is surprising to note how many of our common plants, especially 

 members of the Composite family are naturalized from Europe. 

 Many of them are unwelcome immigrants, and only by a determined 

 effort on the part of the farmer can they be held in check. Of these 

 the Burdock, [Arctiiwi Lappa Z.) is the most conspicuous. It is 

 seldom seen in the open fields, but about the farm buildings if left 

 alone it will crowd all other plants to the wall. 



On the contrary the Common Daisy, {Chrysanthemum Leucan- 



