320 EXPEEIMENT STATION" KECORD. 



of superphosphate from a Russian rock phosphate. Somewhat better results 

 were obtained with the waste than with ordinary siilphuric acid, the super- 

 phosphate obtained being drier and more pulverulent than ordinary super- 

 phosphate. 



Value of fertilizing constituents of weeds of Indiana: Analysis of iron- 

 weeds, F. Matheks and Gatl M. Stapp (Proc. Ind. Acad. Sci., 1911, pp. Ski, 

 SJt2). — Two analyses of ironweeds are reported showing 1.28 and 1.29 per cent 

 of nitrogen, 0.63 and 0.66 per cent of phosphoric acid, and 0.98 and 0.95 per cent 

 of potash. 



Fertilizers, R. E. Rose and L. Heimburgee {Fla. Quart. Bui. Agr. Dept., 23 

 (1913), No. 2, pp. 93-10//, 108-114). — An account is given of the fertilizer inspec- 

 tion during 1913, including analyses of fertilizers examined, with notes on laws 

 and regulations and valuation of fertilizers. 



Analyses of fertilizers, fall season, 1912, B. W. Kilgoee et al. (Bui. N. G. 

 Dept. Agr., 34 (1913), No. 1, pp. 96). — This bulletin contains analyses of fer- 

 tilizers collected by the fertilizer inspectors of the state department of agri- 

 culture during the fall of 1912, as well as a list of brands of fertiUzers regis- 

 tered for sale during the faU season. 



AGHICTJLTTJRAL BOTANY. 



Form and structure of certain plant hybrids in comparison with the 

 form and structure of their parents, H. B. Bkown (Mississippi Sta. Tech. 

 Bui. 3, pp. 54, flgs. 53). — An investigation is reported on the inheritance of 

 histological charactei-s as shown by microscopical studies of certain hybrids. 

 The hybrids were obtained by crossing three species of Nicotiana and the 

 genera Raphanus and Brassica. 



The majority of the characters of the hybrids studied were intermediate 

 between the corresponding characters of the parents. 2V^. tabaciim, when used 

 as a pistillate parent in a cross with N. sylvestris, influenced the external or 

 morphological characters of the hybrid to the extent of 64.6 per cent, and the 

 histological characters 61.9 per cent. When used as a pistillate parent, N. tabacum 

 crossed with N. alata influenced the external characters of the hybrid to the 

 extent of 36.5 per cent, and the histological characters 37.2 per cent. When 

 R. sativus was used as a pistillate parent in a cross with B. oleracea caulo-rapa, 

 it had influence over the external characters of the hybrid to the extent of 62.2, 

 and the histological characters 54.7 per cent. 



The author states that there is a close relation between the external and 

 histological characters. In every hybrid studied, the parent having the higher 

 percentage of dominance in one set of characters was also dominant in the other 

 set by about the same percentage. Neither parent in the crosses studied exer- 

 cised a uniform influence over any particular characters of the hybrid or over 

 the sum total of all characters. 



A bibliography of the subject is appended. 



On the partial sterility of Nicotiana hybrids made with N. sylvestris 

 as a parent, T. H. C^oodspeed (Univ. Cal. Pubs., Bot., 5 (1513), No. 4, PP- 

 189-198) .—In continuation of studies in Nicotiana (E. S. R., 28, p. 530), the 

 author gives the results of a study of Pi hybrids produced between N. sylvestris 

 and N. tabacum mao'ophylla purpurea, particular attention being given to the 

 phenomenon of sterility in hybrid plants grown from the hybrid seed resulting 

 from the 1911 crosses. 



It is said that one of the noticeable traits of these plants was the readiness 

 with which the flowers fall immediately after anthesis. due to the formation of 

 an absciss layer, which cuts off aU possibility of the transfer of food materials 



