480 EXPERIMENT STATION RECORD. 



productivi' alter lu'ln^ cut 10 day.s in succeHsioii. After long, dry, liot i)eri()ds when 

 rahiH had connuenceil ol<l wounds which had lon^r ceased to flow frecjuently broke 

 out again and produced long tears of ru])l)er. 



Greenhouses, L. ('. Cokhett (11V,s7 Yirghua Stn. Bui. 87, /*/'• 1 l-'>-l.i'i., jils. ,?, 

 figs. ™^). — Notes are given on the comparative dural)ility of greenhouse walls as indi- 

 cated l)y station experience, and suggestions given on building greenhouses. 



For practical j)urposes in West Virginia the authf)r considers a 9-in. wall, con- 

 structed of ])rick laid in doul)le courses with about 2 in. air space between the 2 lay- 

 ers, the most satisfactory. The desirability of having s])ace left at the back of benches 

 so that warm air can ])ass nj) from below is pointed out. The author's exj)erience 

 with various kinds of metal benches indicates that over a series of years these may 

 be as cheap as wood benches, and are much more satisfactory as regards snbirrigation. 

 A 7-ft. bench in the center of the greenhouse was found much more efficient for rose 

 growing when divided into 2 benches each 3 ft. 4 in. wide, with a 4-in. space between 

 the 2 sections. The current of warm air passing up between the benches was very 

 beneficial. 



In the author's opinion an ideal ventilator should consist of "two narrow lines of 

 sash, one on either side of the comb and hinged at the l)ottom of the sash so as to 

 make a broad flue or opening in the top of the house when the ventilators are open." 

 A desi'ription is given of a device for fumigating the greenhouse with sulphur. The 

 author discusses the use of large-sized glass and of sash bars in greenhouse construc- 

 tion, and suggests that where 16 by 20 in. or 16 by 24 in. glass is used the sash bars 

 should be I2 by 3 in., while for glass 14 by 20 in. or less sash bars may be 2\ by 

 I5 in., and for 12 by 14 in. glass with bars 12 in. apart a bar 1 by If in. is considered 

 satisfactory with proper i^urline supports. Directions are given for laying lapped 

 glass roofs nmch more rapidly than by the usual methods observed. 



FORESTRY. 



Sylviculture, A. Fron {Sylviculture. Paris: J. B. Bailli^re & Sons, 1903, pp. XII 

 -j-563,figs. 55). — This volume, which is one of a series issued as an agricultural ency- 

 clopedia, is designed not only as a handbook on forest culture, but as a source of 

 information on all branches of forestry. The principles of tree growth are discussed, 

 after which the tree as a factor in forestry is considered, and the principal species of 

 forest trees are described, their distribution, habits, and uses being shown. 



In practical sylviculture reforestation is discussed at length, various cultural prac- 

 tices being described. The principal types of forests are mentioned, their uses and 

 advantages being pointed out. The concluding portion of the l)ook relates to forests 

 as business enterprises and gives directions for their management, exploitation, 

 estimation of standing timber, valuation tables, etc. 



Courses in forestry at agricultural colleges, S. B. Green {Forestry and Irrig., 

 9 {1903), No. 11, pp. 55^-554). — The author briefly reviews some of the courses of 

 instruction that should be embraced in or collateral to courses in forestry in agricul- 

 tural schools. 



Second annual report of the forester, W. Mulford ( Connecticut Slate Sta. Bpt. 

 1902, pt. 4, pp- 4f^S-470, i>h. 2). — In his work on the development of the farm wood 

 lot, the forester reports the experimental work carried on by the station in which 

 64 experimental plantations are described, as -well as cooperative plantings made by 

 2 private parties and l)y the city of Middletown on its waterworks property. The 

 treatment of the forest is described and an outline given for the future plantings of 

 this tract. 



As State forester, the author reports upon the purchase of 698.5 acres as a site for 

 a State forest, at a cost of $1,110.12. This area has been surveyed and marked, and 

 preliminary investigations begun for its reforestation. The forestry act under which 



