iQoS] . CURRENT LITERATURE 



205 



bama, competition between oaks, and the forest lesources of Georgia. The 

 paper on Bald Knob (Plant World 9:265-269. 1906) recounts an interesting 

 occurrence of coastal plain plants on the xerophjtic sununit of a hill. Here there 

 IS strong evidence that this is a pioneer plant association, a fact which the author 

 doubtless correctly thinks is in favor of the theory that the coastal pines represent 



formation 



Q 



Ihe paper dealing with competition in oaks (Plant WorL 

 recounts the crowding-out of specimens of Qtiercus laurijoli 



former oak is a pioneer, and the latter a denizen of the climax 



forests of the region. The paper on the forest resources of Georgi 



dis 



accompanied by a map.— H. C. Cowles 



Georgi 



ecology. — ^WKiTroRD 



j^\ 



vegetation is a record of the first attempt to test the principles of physiographic 

 ecology in the tropics, and hence Is of more than usual interest to ecologists 

 who have worked only in the temperate zone. The area studied embraces 

 the slopes of Mt Mariveles, from the sea-Ievel to an altitude of 1400 meters. 

 The introduction includes remarks on the importance of determining the avail- 

 able water-content of the soil at all seasons, and some mention is made of the 



and 



practical application of ecological study. The climate has well-mailed wet 

 diy periods, and yet evergreens are as characteristic of the vegetation as are de- 

 ciduous trees. The prevailing forest type is thus midway bet^^^een Schimper^s 

 rain-forest and the monsoon forest. Possibly the retention of much water in the 



during the relatively short dry period is a factor in the ma 



forest 



Whitpord's belief that this is the general type to which other formations of the 

 region are tending. An interesting feature here are the parangs, which are arti- 

 ficial formations, corresponding somewhat to our clearings. There are various 

 ^3T>^s, but all seem to show evidence of gradual displacement by the culminating 

 Bambusa-Parkia forest. A further similar evidence of this is the appearance of 

 natural xerophytic patches resembline the parang within the Bambusa-Parkia 



forest Next up the slope comes the Anisoptera-Strombosia formation 



dominance 



enormous 



number of tree species in these forests. Here, as in ail of the formations, many 

 details are given of the hfe-habits of the plants. The buttressed bases are a^o- 

 ciated with the overtowering trees of the hi^est forest stratum. Next come ilie 

 Diptenxarpus-Shorea formation, in which 10 per cent of the species are dip- 



and 



From the first to the last 



formations named above there has been a progressive increase in me^phytism 



a^d in the dommance of the evergreen habit, correlated wiA a similar 



w-UC^ 



'HrrroRD, H. N., The vegetation of the Lamao forest reserve. PhiHpp 

 ^=373-43^» 637-6S2. 1906. 



