655 



studies on the action of fluorides on yeasts, J. Effroxt. — Monit. soientif., 5, 

 pp. 1137-1144. 



Digestive ferments in the fetus of the cow and the sheep, and in newly born 

 dogs and cats {Die Verdamingsfennente beim Embryo mid Xeugeborenen), F. KrOger. — 

 Centralbl.f. Physiol., 5, p. 612. 



On the determination of mineral substances in humus and on their function 

 In agriculture — a method of analysis {Sur le dosage des matieres minerales contenus 

 dans la terrc r^gvtale ef siir leur role en agriculture — Methode d' analyse), Bkrtiielot and 

 Andkk. — Ann. Chim. et Phys., torn 25, ser. 6, pp ,?S9-51L 



The history of the nitrogenous substances contained in humus {Faits pour ser- 

 vir a I'historie des principes azotes renferm^s dans la terre v4g^tale), Berthelot and 

 AXDRE. — Ann. Chim. et Phys., torn 25, s4r. 6, pp. 314-336. 



The nature of the sulphur compounds in the soil {Sur la nature des composes sul- 

 farh contenus dans le sol), Berthelot and Andre. — Ann. Chim. et Phys., torn 25, ser. 

 6, pp. 356-341. 



Investigations on humic substances (Becherches sur les substances humiques), 

 Berthelot and Andr^. — Aim. Chim. et Phys., torn 25, s6r. 6, pp. 364-403. 



Calorimetric investigations on the humic acid derived from sugar (Becherches 

 calorime'triques sur I'acide humique deriv4du sucre), Berthelot and Andre. — Ann. Chim. 

 et Phys., torn 25, s6r. 6, pp. 403-420. 



Comparative nitrification of humus and of purely organic materials, and the 

 influence of the proportion of nitrogen in humus on nitrification {Nitrification 

 comparee de V humus et de la matit-re organique non alteree, et influence des proportions 

 d'azote de I'humus sur la nitrification), P. Pichard. — Compt. rend., 114 {1892), pp. 490- 

 493. 



The formation and behavior of basic calcic phosphate and its connection 

 •with Thomas slag {Bildnng und Verhalten basischer CalciumphosphatexmdihreBezieh- 

 ungen zur Thomasschlake), O. Forster. — Zeitsch.f. angew. Chem., 1892, pp. 13-22. 



The manufacture of superphosphate from phosphates rich in arsenic ( Ueber 

 Herstellung von Superphosphaten aus arsenreiehen Phosphaten), Schucht. — Zeitsch. f. 

 ^angew. Chem., 1891, pp. 667-671. 



Field experiments w^ith barnyard manure preserved with superphosphate 

 gypsum {Feldversuche mit Superphosphatgyps-Mist), J. R. Schiffer. — Zeitsch. d. landw, 

 Ver. f. Bheinpreussen, 1892, pp. 43, 44. 



Effect of increasing amounts of nitrate of soda on the yield of rye ( Wirkung 

 gesteigerter Chilisalpeterdiingiingen auf die Boggenernte), G. Marek. — Wiener landw. 

 Ztg.; abs. in Braunschwg. landw. Ztg., 1892, p. 14. 



Nitrogenous fertilizers for winter grain {Die Stickstoffdiingung fUr Wintergetreide), 

 A. Leydhecker. — Oesterr. landw. Wochenbl.; abs. in Braunschwg. landw. Ztg., 1892, pp. 

 5, 6. 



Variations in the composition of Jerusalem artichoke {Des variations dc compo- 

 sition du topinambour), G. Lechartier. — Ann. Agron., 1892, torn 18, pp. 68-91. 



Chemical composition of light and heavy oats (Cftemiscfte Zusammcnsetzung des 

 "leichten" und " schiveren" Hafers), R. Heinrich. — Landic. Ann. d. meek. pat. Vereins, 

 1892, No. 6, pp. 46-49. 



Composition and value as food of tubers of Stachys tuberifera {Zusammcnsetz- 

 ung u. Ndhrwert der Knollcn von Stachys tuberifera), F. Strohmer and A. Stift. — 

 Oesterr. ungar. Zeitsch.f. Zucker-Ind. u. Landic, 20, p. 803. 



Ne^w varieties of potatoes {Nouvelles vari4t6s de pommes de terrre), A. Dubois. — 

 Jour. d'Agr. prat., 1892, tom 1, pp. 282, 283. 



Improvement of potatoes by selection of seed tubers rich in starch {Die Ver- 

 hesserung der Kartoffelsorten diirch Auswahl stdrkereicher Mutterknollen), E. Marek. — 

 Fiihling's landw. Ztg., 41 {1892), Reft 5, pp. 164-171, and Heft 6, pp. 209-214. 



Improvement in the culture of potatoes in France ; results of the campaign 

 of 1891 {Am6lioration de la culture de la pomme de terre induatrielle et fourragere en 



