244 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Average green weight 

 Barley Rye 



100 . . 160 



76 . . 71 

 59 . .56 



The amount of depression in weight was nearly equal to that pro- 

 duced by the addition of sulphuric acid of equal strengths, and it seems 

 probable that the suggestion made by Boiret and Paturel {Ann. Agron. 

 vol. xviii. (1892), p. 417-440) that the adverse action of ferrous sul- 

 phate on growth is due to the liberation of sulphuric acid as the salt 

 passes to the ferrous condition is the true one. — F. J. C. 



Feptilizing- Value of Hairy Vetch for Connecticut Tobacco 



Fields. By T. E. Eobinson {U.S.A. Dep. Agr., Bur. PI. Ind., Girc. 

 15 ; October 1908). — Preliminary facts were published in 1905 in regard 

 to "a new and valuable cover crop for tobacco fields," namely, 

 Eussian or hairy vetch {Vicia villosa). This legume was found to 

 be resistant to cold, heat, and drought; occupied the ground during 

 the fall, winter, ajid spring; decayed rapidly when turned under, 

 and enriched the soil by its ability to *' fix " or utilize atmo- 

 spheric nitrogen when properly inoculated — that is, when the bacteria 

 were present to cause the formation of root nodules. Unless the 

 bacteria were artificially supplied it was found that nodule formation 

 was lacking or very tardy. *' The roots of plants from inoculated 

 seed bore many tubercles, some aggregations of them being as large 

 as corn kernels. When the seed was not inoculated the roots bore 

 few, if any, nodules, and the growth of the plants was much less 

 vigorous " (Conn. Agr. Exp. Stn. Bull. 149, p. 6). The present 

 circular deals with the necessity of inoculating the seed, as where hairy 

 vetch has been inoculated and an abundance of root nodules have 

 resulted the tobacco following has been greatly benefited both as to 

 yield and quality. Tables are given showing results of experiments with 

 inoculated and uninoculated hairy vetch. — F. G. J. 



Forestry Conditions in Ohio. By W. J. Green and E. Secrest 

 {U.S.A. Agr. Exf. Stn., Ohio, Bull. 204, June 1909).— The conditions 

 of forestry in Ohio are encouraging, and the account of the various 

 species of Catalpa must be read with pleasure by those who are in- 

 terested in the growth of the tree in this country. There is an | 

 exhaustive list of the principal forest trees, no fewer than twelve of 

 which are commonly cultivated in the British Isles. — A. D. W. 



Forestry in the United States, The Status of. By T. Cleve- 

 land {U.S.A. Dep. Agr., Forest Service, Circ. 167, Sept. 1909).-- 

 A valuable account is given of what is being done both by the State and 

 private persons in the matter of forest extension. Three- fourths of the 

 forests are in private hands. — A. D. W. 



Without ferrous sulphate 

 N 



ferrous sulphate . 



2500 ^ 



N 



ferrous sulphate . 



1250 ^ 



