734 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



. . . fresh manure ; for the former is much more heavily charged 

 with food for the denitrifying organisms than that which has undergone 

 a greater amount of fermentation." 



On p. 115. "It was found ... in the warm climate . . . that 

 organic nitrogen was superior to nitrogen in sulphate of ammonia 

 due, presumably, to the rapid nitrification of the former, and to its 

 loss by drainage before the plants could utilize it." 



On p. 164 we read : " The total sales of cyanamid are claimed to 

 have risen in two years to 4,000,000 tons per annum." An obvious 

 error. 



On p. 259. " The effect of potassium salts upon wheat and 

 barley . . . has been found to be far more favourable in wet than in 

 dry seasons, due possibly to its preventing premature ripening." 



On p. 364. " The protozoa probably concerned in the destruction 

 of the bacteria were found to be," &c. 



These errors and obscurities will doubtless be put right in the next 

 edition. 



" Camping in Crete ; with Notes upon the Animal and Plant Life 

 of the Island." By Aubyn Trevor-Battye, M.A., F.L.S. 8vo., 

 xxi + 308 pp. Map. (Witherby, London, 1913.) 10s. 6d. net. 



This is a charming and straightforward tale of journeys in Crete, 

 told simply and well by an observant traveller-naturalist, with an 

 eye for plants and birds and beasts, an interest in the people and their 

 ways, and a liking for getting at the meaning of ancient buildings and 

 remains. The plates which adorn the text are excellent, and there is a 

 capital chapter on the Cretan caves by Dorothea M. A. Bate, who also 

 contributes notes on the mammals. The garden-lover will naturally 

 turn to the notes on the Cretan flora with expectancy and he will not 

 be disappointed, for, although short, they are very informing. Not a 

 few are garden plants, and the notes on the five Cretan Cistuses are 

 extremely interesting. We gather the author secured some bulbs 

 of Chionodoxa nana. Does anyone else grow it in England ? 



" The Fungi which cause Plant Disease." By F. L. Stevens, 

 Ph.D. 8vo., ix + 754 PP- (Macmillan, New York, 1913.) 17s. net. 



One of the chief difficulties the worker with plant diseases has to 

 contend against is that of finding descriptions of disease-causing 

 fungi, so 'that they may be recognized. The literature is very scattered, 

 and Professor Stevens has done well to bring together the matter in 

 this volume within the covers of one book. Not only are descriptions 

 given, but bibliographical references which the student will find of 

 great value. The book is supplementary to the author's " Diseases 

 of Economic Plants," and contains no references to preventive and 

 remedial measures, or to the grosser symptoms produced by the 

 fungus attack ; these must be sought in the former volume and in 

 others of a like nature. It is well illustrated, and a book which every 

 worker with plant-disease fungi must needs have upon his shelves. 



