1905] TRANSEAUBOGS OF THE HURON RIVER VALLEY 441 



Equisetum limosum, Cornus candidissima, Aronia nigra, Rosa 

 Carolina, Juncus effusus, Calamagrostis canadensis, Rubus strigosus, 

 Ilicioides mucronata, Comarum palustre, Carex filiformis, Panicu- 

 laria canadensis, and Poa flava. Forming a high border about the 

 tamaracks and spruces are numerous large plants of Vaccinium 

 corymbosum and Ilicioides mucronata. 



The very marked difference between the vegetation of the central 

 and marginal parts of the bog are worthy of especial note. The 

 former represents the original vegetation of the bog. The latter 

 illustrates most forcibly that under present conditions a very different 

 set of plants springs up and becomes dominant, in spite of the fact 

 that the true bog plants were near at hand when the clearing 

 occurred. This bog also illustrates that stage in the filling of a 

 depression immediately following the disappearance of the lake. 



In other bogs near Oxford, Dasyphora fruticosa and Chiogenes 

 hispidula occur among the shrubby growth. 



THE DELHI MUSKEAGS. 



In the bog north of Delhi which has already been described 

 occur two areas, somewhat to the west of the lakes, which seem to 

 represent a later stage in the history of a bog than that shown by the 

 lakes. These areas, if they were found in northern Michigan, would 

 be termed "muskeags." They are surrounded by large tamaracks, 

 and small tamaracks occur throughout, the smallest specimens toward 

 the center. If the bog at Oxford were to continue its work of filling 

 until the central society disappeared, we should have a bog area of 

 much the same appearance. The small tamaracks stand far apart, 

 and between them is a most luxuriant growth of cassandra and 

 sphagnum. The hummocks rise between 3 and 4 feet (0.9-1. 2 m ) 

 above the substratum. As one attempts to traverse these areas, he 

 sinks knee-deep in the long, fibrous, peat moss. 



The total number of species is very small, and includes, besides 

 those already mentioned, Andromeda polifolia, Sarracenia purpurea, 

 Oxycoccus macrocarpus, and a few specimens of Vaccinium corym- 

 bosum. 



BOG ON CARPENTER ROAD 



This bog is situated in the SW. ^ Sec. 36, Ann Arbor Tp. Its 

 basin is a small depression in the glacial moraine occupying about 



