560 Agriculter, etc. — Chemisches, etc. — Personalnachrichten. 
des späteren Teiles der Vegetationsperiode im Jahre 1906 herr¬ 
schend anhaltende Trockenheit in ungleichem Grade beeinflusst 
wurden. Die günstigsten Resultate lieferte Hannchen. Auch die 
Perlgerste sowie in gewisser Beziehung die Prinzessingerste sind 
gegen Trockenheit widerstandsfähig, obwohl nicht in so hohem 
Grade wie Hannchen. Die Chevaliersorten waren den übrigen 
Sorten durchgängig unterlegen. Den niedrigsten Proteingehalt hatten 
die Körner der Prinzessingerste. Grevillius (Kempen a Rh.) 
Sp enee, D., Analysis of a latex from Funtumia elastica. (Quart. 
Journ. Inst. Com. Research in Tropics, Liverpool. Vol. II. p. 105— 
112. 1907.) 
Various methods of coagulation were tried, the best appearing 
to be addition to the latex of dilute solution of acetic acid containing 
an equal volume of an alcoholic solution of creosote (20 : 1) until the 
whole liquid is markedly acid. Other experments tended to show 
that the nitrogenous substances in the latex can be changed by 
digestion with trypsin into simple complexes without causing coagu¬ 
lation of the latex. The bearing of this on theories of coagulation of 
latex is discussed, and also the possibilitjr of improving latices by 
getting rid in this manner of the protein. 
Chemical analyses are given of the latex and of rubber pre- 
pared from same by method of coagulation described above. 
W. G. Freeman. 
Spenee, D., On the Crystalloids and inorganic Constituents 
(Ash) in Rubber latex, with a new method for their esti- 
mation, having special reference to a latex from Funtumia 
elastica , Stapf. (Quart. Journ. Inst. Com. Research in Tropics, Li¬ 
verpool. Vol. II. p. 113—119. 1907.) 
A method of dialysis is described which “not only offers an 
accurate and simple method of determining the sugars, organic acids, 
inorganic and other constituents in the latex but affords an easy 
means of studying more closely the form in which these substances, 
organic and particularly inorganic, are present in the latex in its 
natural stade and how they are combined therein”. 
The inorganic constituents in raw latex consist of one or more of 
the following: iron, aluminium, calcium, magnesium, potassium and 
sodium with small quantities of Chlorides, sulphats and possibly 
Phosphates. The soluble organic constituents are sugars, glucosides (?), 
organic acids & their salts, and nitrogenous bodies. 
The percentage of potassium salts in a sample of washed rubber 
of Funtumia elastica is an indication of the purity of the rubber and 
the efficency of the washing process. W. G. Freeman. 
Personalnaehriehten. 
Dr. G. Tischler in Heidelberg erhielt für 1908 das Buiten- 
zorg Stipendium des deutschen Reiches, sowie 1000 Mk. v. d. 
badischen Reg. um nach Beeindigung seiner Studien auf Java, 
Amani (Deutsch-Ostafrika) zu besuchen. 
Ausgegeben: 26 Mai 1908. 
Verlag von Gustav Fischer in Jena. 
Buchdruckerei A. W. Sijthoff in Leiden. 
