288 Agricultur etc. — Personalnachrichten. 



QuARTAROLi, A. c G. Masoni, Sugli acidi liberi dei perfos- 

 fati minerali e d'ossa. (Staz. sperim. agraria. Vol. XXXVIII. 

 1905. p. 492—502.) 



Messungen der Affinitätskonstante verschiedener Phosphor- 

 düngemittei durch Rohrzuckerinversion bei 25 '' C. zeigten, dass in 

 mineralischem Phosphordünger viel weniger freie Phosphorsäure 

 vorhanden ist, als es die analytischen Methoden anzeigen, während 

 im Knochenphosphat nur spurweise oder überhaupt keine freie Phos- 

 phorsäure vorkommt. E. Pantanelli. 



Stewart, F. C, H. J. Eustace and F. A. Sirrine, Potato sprayin g 

 experiments in 1905. (New York [Geneva] Agric. Expt. 

 Station Bull. CCLXXIX. p. 155—229. 1906.) 



This gives the results of extensive spraying experiments with 

 potato diseases in the year 1905, seventy different experiments being 

 reported. In the 10 year experiments at Geneva the yield was in- 

 creased 119^3 busheis per acre by five sprayings, while three gave 

 an increase of 107 busheis. At Riverhead the gain respectively was 

 82 busheis and 31 '/s busheis per acre. In thirteen „farmer's business 

 experiments" including lö^'/s acres the gain due to spraying was 

 46^2 busheis per acre; the average cost of spraying was Dollar 4.25 per 

 acre; the average cost of each spraying was 98 cents per acre; 

 and the average net profit was Dollar 20.04 per acre. In fifty volunteer 

 experiments including 407 acres there was an average gain of 59^2 

 busheis per acre. In 29 of these experiments the average cost of 

 spraying was Dollar 4,57 per acre: the average cost of each spraying 

 was 92 Cents, and the average profit was Dollar 29.85 per acre. Soda 

 Bordeaux is not as good as lime Bordeaux for potatoes. Paris 

 green at the rate of 1 — 2 Ibs. per acre and arsenite of soda at the 

 rate of 1 quart stock Solution (Kedyie formula) per 50 gals water are 

 perfectly safe. No attention need be given the temperature of the 

 Bordeaux mixture. The tendency is for spraying to decrease the 

 rot of tubers; it always increases the yield of marketable tubers. 



Perley Spaulding. 



Personalnachrichten. 



Dr. Max Körnicke, Privatdozent der Botanik a. d. Univ. Bonn, 

 erhielt für 1906 07 das Buitenzorg-Stipendium des Deut- 

 schen Reiches. Er hat seine Ausreise am 29. August ange- 

 treten. 



Gestorben: Prof. Harry Marshall Ward, F. R. S. Sc. D., in 

 Torquay, im 52. Lebensjahre. — Prof. Dr. C. A. J. A. Oudemans, in 

 Arnhem, früher Prof. der Botanik in Amsterdam, im 80. Lebens- 

 jahre. 



Berichtigung. 



Auf p. 192 ist zu lesen: Dr. V. Gräfe für chemische Pflanzen- 

 physiologie habilitiert an der Universität Wien, statt : an d. Univ. Berlin. 



Ausgegeben: 18. September 1906. 



Verlag von Gustav Fischer in Jena. 

 Druck von Gebrüder Gottüelft, Kgl. Hofbuchdrucker in Cassel. 



