1917] POEESTEY. 649 



Citrus experimental grove, S. E. Coluson {Florida Sta. Rpt. 1916, pp. IIS- 

 118). — In continuation of previous reports (E. S. R., 35, p. 839) measurements 

 are given showing the average gain in diameter of trees from June, 1909, to 

 June, 1916, growing on the various fertilizer plats in the citrus experimental 

 grove. The lime requirements as studied for each plat are also presented ia 

 tabular form. 



The data secured show^ that the acidity of the plats varies from season to 

 season, being greatest in summer and least in winter. The greater increase in 

 acidity during the summer is attributed to the increased decay of vegetable 

 matter. Plats receiving strongly alkaline materials, such as lime, limestone, 

 and hardwood ashes were alkaline in reaction, and those receiving mildly alka- 

 line materials such as Thomas slag and nitrate of soda showed a decrease in 

 acidity. The use of phosphoric acid from floats has not served to decrease the 

 acidity of the soil. 



Do fertilizers influence the composition of oranges P H. J. Webbeb {Cal. 

 Citrogr., 2 {1917), No. 6, pp. 17-19). — A brief analysis of experiments previously 

 reported by H. D. Young (E. S. R., 86, p. 642). 



Standards of maturity for the Washington navel orange, E. M. Chace {Mo. 

 Bui. Com. Hort. Cal., 6 {1917), No. 8, pp. 325-3 SO). —The substance of this ar- 

 ticle has been noted from another source (E. S. R., 37, p. 345). 



Some notes on frost protection in orange groves, R. S. Vatle {Cal. Citrogr., 

 2 {1917), No. 6, pp. 10, 11, 16). — A paper on this subject read at the Orange 

 Show Convention, in which the author reviews the work of various citrus asso- 

 ciations and individual growers in protecting groves from frost and makes 

 some deductions relative to the value of frost-protective methods. 



It is concluded in brief that although it is entirely possible to protect orange 

 groves against frost it may or may not be profitable, depending upon the size 

 of the crop, amount of actual risk, and amount of protection necessary for any 

 particular grove. It is believed that more attention should be given to the 

 adding of heat units than to the prevention of radiation by the formation of a 

 cloud of smoke. 



Preventing frost damage in transit, A. W. McKay {Col. Citrogr., 2 {1917), 

 No. 6, pp. 4, 5, 17, figs. 4). — The results of experiments conducted by the TJ. S. 

 Department of Agriculture during two seasons to determine means of prevent- 

 ing frost injury to citrus fruits in transit are here reported. 



Effect of different methods of transplanting coffee, T. B. McClelland 

 {Porto Rico Sta. Bui. 22 {1917), pp. 11, pi. i).— This bulletin reports the result 

 of a trial test of different methods of transplanting coffee, shows the advan- 

 tages and disadvantages of each method, and gives suggestions relative to the 

 correction of bad practices. 



Briefly stated, the test shows that the transplanting of moderately large 

 coffee seedlings, either from or into a heavy clay soil, should unquestionably be 

 done with the roots still incased in the soil in which they grew. 



A preliminary report on some breeding experiments with foxgloves, B, 

 Wabben {Biometrika, 11 {1917), No. 4, pp. S0S-S27).—A discussion of the re- 

 sults secured in a number of first generation crosses. 



FORESTEY. 



Second biennial report Nebraska Forestation Commission, O. Rohde, A. H. 

 Metzgeb, and W. Ball {Bien. Rpt. Nebr. Forestation Com., 2 {1916), pp. 19). — 

 This report contains recommendations and outlines of proposed legislation 

 dealing witii forestry in Nebraska. 



