28 EXPERIMENT STATION KECORD. [Vol.43 



Fertilizers, J. A. Voki.ckek (Jour. Roil. Afir. Soc. Enylaud, 7'J (1918), pp. 

 250-253; abs. in Chcm. Abs., U (1920), No. 3, p. 306).— Analyses of a number 

 of .samples of flue dust and blast furnace dust sbow the potash content to vary 

 from 0.87 to 7.82 per cent. Analyses of refuse manures, leather, and lime are 

 also discussed. 



[Comiiiercial fertilizer law and registered brands of commercial fer- 

 tilizers to December 31, 1919] (III. Dept. Agr. Bid. 279 (1919), pp. 107- 

 jlJf).— This section of this bulletin contains the text of the Illinois fertilizer 

 insi»eclion law, and analyses of 144 samples of fertilizers and fertilizer 

 materials rej^istered for sale in the State during 1919. 



Commercial fertilizers, H. E. Curtis and AV. Rodes (Kentuclcy Sta. Bui. 

 219 (1918), pp. 163-259). — Analyses and valuations of samples of 724 different 

 brands of fertilizers and fertilizer materials, collected for inspection in Ken- 

 tucky dui-ins 1018, are reported. The results of these analyses show that in 

 most cases the samples analyzed have come fully up to the guaranties, or, 

 where there is a slight deficiency in one ingredient, it has been made up by an 

 excess in one or both of the other ingredients. 



Inspection of commercial fertilizers for 1919, T. O. Smith (New Hamp- 

 shire Sta. Bill. 194 il91i>)' PP- [i4]).— This bulletin contains the text of the 

 New Hampshire State fertilizer law, and reports the results of actual and 

 guarantied analyses of 110 samples of fertilizers and fertilizing materials 

 offered for sale during 1919. 



Analyses of fertilizer spring season, 1919 (Bui. N. C. Dept. Agr., J^O 



(1919), No. 7, pp. 8). — This bulletin contains the results of analyses and valua- 

 tions of 123 samples of fertilizers and fertilizer materials collected for inspec- 

 tion in North Carolina during the spring of 1919. 



AGRICULTURAL BOTANY. 



Physiology of the apple, O. R. Butler, T. O. Smith, and B. E. Cubky 

 (New Hampshire Sta. Tech. Bui. 13 (1917), pp. 3-21, pi. 1). — A report is given 

 of studies on the distribution of food materials in the apple tree at different 

 periods of vegetation. Determinations were made of the percentages of sac- 

 charose, reducing-sugars, starch, ether extract, ash, nitrogen, phosphorus, and 

 potassium present in a summer's growth, in branches from one to five years 

 old, and in large and small roots, the samples being taken at different stages 

 of vegetation. 



It is stated that in apple trees carbohydrates are stored as starch or as 

 saccharose. At the awakening of vegetation, the hydrolysis of starch is more 

 marked in two- and three-year-old branches, but is still not extensive. During 

 the growing season saccharose and starch accumulate in small roots and in 

 branches of two and three years. Fats are always present in the apple tree, 

 apparently functioning as reserve food material. Reducing sugar is the trans- 

 location form for the carbohydrates. An account is given of its movement and 

 transformation. Nitrogenous reserve materials are stt)red mainly in younger 

 branches, from which they pass in spring to actively growing regions. 



Ash is more abundant in young than in old organs. Translocation of ash 

 material occurs from small roots to one-year-old branches in spring, but little 

 or no migration occurs from the large roots or the older branches and trunk. 

 As new growth develops, ash passes from the one-year-old branches into the 

 shoots, and with the development of an absorbing root system the ash con- 

 stituents enter the tree, raising the ash content of the small i-oots. The phos- 

 phorus required in building the first new tissues is obtained mainly from the 



