1^6 'The t»LANT World. 



British Islands. The richest desmid floras are found where 

 favorable habitats with abundant precipitation combine with 

 a drainage water from the older geological formations. The 

 factors, physical, or historical, or both, determining this call for 

 farther investigation. 



Ostenfeld, in his Botany of the Faroes, published in Copen- 

 hagen, gives an account of the vegetation of these islands in 

 which he discusses the influence of climate and edaphic factors, 

 the influence of man and animals, the biological characters of 

 the various species, the natural plant formations and the forma- 

 tions in the cultivated areas. Among the most common forma- 

 tions are the moor, the heather moor, the cliff vegetation, and 

 the rocky-flat formation. 



Dickey has published in the Ohio Naturalist the results of 

 his observations in a bog habitat. Climatological and evapora- 

 tion data are given for the bog islands at Buckeye Lake, Ohio, 

 which appear to be sufficiently exact and extended to serve as a 

 means of comparison with similar habitats elsewhere. 



From a review by Ostenfeld of his own observations of the 

 immigration of Biddtdphia sinensis and its occurrence in the 

 North Sea it seems probable that this diatom was not carried 

 there bv currents but was brought from distant oceans by the 

 aid of man, probably from the Indian Ocean by ship, attached 

 to the outside or living in the water of the hold, or in the water 

 of a bucket of a Hamburg steamer. The author gives details 

 of its distribution and wanderings from 1904 to 1907, together 

 with an account of its periods of maximum and minimum de- 

 velopment and the position of its area. 



Cook, in his account of the local adjustment of cotton va- 

 rieties (Bull. 159, Bu. PI. Ind.), assigns to local adjustment a 

 much greater and more general agricultural importance than 

 acclimatization. Failure to make use of it causes a general loss 

 to the cotton industry represented by enormous totals. With 

 very slight expense of time and eff'ort in the selection of seed for 

 local adjustment and with no other change, either in varieties, 



