824 PRACTICAL PLANT PHYSIOLOGY. 



hills that, if the general opinion of botanists were not unfavourable 

 to [its] being considered a native of Britain, it might well be thought 

 to be indigenous there." Butomus, "■ though usually reported to be 

 a naturalized plant only in Scotland," is, he thinks, "there is little 

 doubt, indigenous in Perthshire." 



The records of stations for rare plants are often accompanied by 

 a caution, which even in these enlightened days is unfortunately by 

 no means unnecessary, as to the moderation which should be 

 observed by collectors. Thus under Saxifraga cernua we read : 

 "It is to be hoped that botanists, when taking specimens, will bear 

 in mind that the limited station on Ben Lawers is the only place in 

 Britain for this plant. The Craig-na-Caillich station seems to be 

 lost." " There is a danger of Phyllodoce ccsrulea being exterminated " 

 from its well-known station, but Dr. White says, "although the 

 ' rediscovery ' of this rare plant has been more than once announced, 

 I am not aware that those who know where to look for it have ever 

 failed to find it." As to Moneses, "owing to the reckless manner in 

 which specimens have been taken by botanists and others, the plant 

 is now nearly extinct at Scone, and appears to flower but rarely." 

 A probable loss is Scheuchzeria, which, Dr. White very much fears, 

 "owing to the altered condition of the locality, has become extinct 

 in the White My re, and hence can be no longer included in the 

 Perthshire list." Certain introductions seem likely to become 

 permanent additions to the flora, such as Sedum album, which 

 increases with remarkable rapidity. "A small piece was planted 

 on the precipice of Kinnoul Hill, and in a few years multiplied 

 to such an extent as to cover for a considerable distance all 

 the ledges of a rock more than 100 ft. in height." On Poa 

 palustris L. we find the following note: "Discovered in 1889 

 by Mr. William Barclay among the rank vegetation on the mud 

 banks bordering the Tay below Perth, and Bennieby Pond near 

 Crieff. Mr. Barclay thinks there is not sufficient evidence for 

 certainty as to this species being native in Perthshire. It had not 

 been previously found in Britain." 



For many other notes of interest we must refer our readers to 

 the book itself, which we trust may be the forerunner of other 

 carefully executed floras of Scottish counties, for which it may well 

 serve as a model. j^^^^ j^^^^^^_ 



Practical Plant Physiology. By. Dr. W. Detmer. Translated from 

 the second German edition by S. A. Moor, M.A. 8vo, pp. xix, 

 555. With 184 illustrations. London : Sonnenschein. 



Dr. Detmer's Pfianzenphysiologische Praktikum, the second and 

 revised edition of which appeared in 1895, is so well known to 

 workers in plant-physiology as to need no word of commendation. 

 It is the only book dealing exhaustively with the subject, and when 

 we state that Mr. Moor has found no sufficient reason for addition 

 or alteration, and has presented in its entirety a translation of this 

 edition, the scope of Messrs. Sonnenschein's latest contribution to 

 our botanical library is at once apparent. Under such circum- 



