144 EXPERIMENT STATION RECORD. 



At the eiul of the seventh day 2J>.()2 per cent of tlie grapes were decayed and 

 only 4.21 per cent of the injured fruit was free from decay. 



One species of Botrytis was found to penetrate the unbroken skin of the 

 berry after the grapes had been subject to a rainy period, the so-called " slip- 

 skin " found after the rains being an early stage of the decay. The importance 

 of culling these out before jiacking the fruit is cnipliasized. 



The development of the leaf perimeter in relation to the yield of grapes, 

 R. A, Sacca {Lo Smluppo del Periinetro Fogliare in Ro/Jiwrto alht I'nxlut- 

 liviid, (leUe Viti. Piacenza, 1<)0!), pp. 12. pf/x. 3). — This is the report of an in- 

 vestigation conducted in the botanical laboratory of the Royal Agricultural 

 High School of Portici. 



A study of various species and varieties of grai)es grown under similar 

 conditions showed a correlation between yield and the amplitude of the angle 

 formed by the median nerve and the lowest constant lateral nerve. In the 

 data secured, the varieties as studied are groui)ed into 3 types according to 

 whether the above-mentioned angle is obtuse, right, or acute. In general the 

 jield decreases with the size of the angle. Eighteen obtuse-angled varieties 

 had an average angle of 113° 26", and an average production number of 24.95. 

 Eight varieties showing an average angle of 90° 22' 30", gave an average pro- 

 duction number of 10.105. Four varieties with an average angle of 69° 34' 30" 

 showed an average production number of 6.38. The same correlation is noted 

 in respect to the sugar content of the must, the acidity increasing as the 

 angle decreases. Cultural conditions appear to influence the intensity of the 

 skeleton network but not to affect the relative direction of the nerves. 



Grape culture, A. Kirk (London and GIas(/otr, 1909, pp. 75, pis. 19, figs. 36). — 

 A treatise on growing grapes under glass, based upon the author's experience 

 and observations covering a long period of years. The text is well illustrated. 



Handbook of grape growing and wine making, A. von Babo and E. Mach 

 (Handbuch des Weinhaaes and ker KeUericirtschaft. Berlin, 1909, vol. 1, first 

 half, 3. ed., pp. XX +623, figs. 276).— The present edition of this old work has 

 been considerably revised and enlarged with a view of including recent viti- 

 cultural knowledge and practice. A'olume 1 takes up the subject of grape 

 growing. 



The first half of this volume, which is here presented, deals in detail with 

 the restoration of phylloxera-infested vineyards. The introduction deals briefly 

 with the history of grape culture, and succeeding chapters discuss the organ- 

 ography, anatomy, and physiology of the grape, ampelography, under which 

 the more important American and European varieties are considered, the 

 selection of American stocks for the reconstruction of vineyards, breeding new 

 varieties, ])ropagati<m, grafting, nursery i)ractices, climate in its relation to 

 grape growing, soils, and the location of new vineyards. The concluding 

 chapter discusses the care of young vineyards during the first five years after 

 planting. 



Protection of fruit trees from rodents, F. H. Ballou (Ohio Sta. Bui. 208, 

 pp. 53-70, figs. 20).— A popular discussion of the injury done to young fruit 

 trees by bark-eating rodents, with illustrated instructions for using various 

 protective coverings and healing girdled trees by bridge grafting. 



Pecans, W. N. IIutt (Bui. X. C. Dept. Agr., 30 (1909), Xo. 9, pp. 50, figs. 25).— 

 This bulletin is a preliminary report of the author's observations and researches 

 during the last three years on the subject of pecan culture in North Carolina. 



General consideration is given to the possibilities for commercial pecan grow- 

 ing and the geographic distribution and soil requirements of the pecan. In- 

 formation follows relative to the establishment and culture of pecan groves, 

 taking up the cost of trees, transplanting and planting operations, fertilizing. 



