Floristik, Geographie, Systematik etc. 231 



gleichmassig den Boden. Die Begleitpflanzen der Fz'o/rt-Subspecies 

 werden genannt. Matouschek (Wien). 



Livingston, B. E., A rain correcting atmometer for eco- 

 logical Instrumentation. (Plant World. XIII. p. 79—82. fig. 1. 

 Apr. 1910.) 



An arrangement for obviating the difficulty arising from rain 

 falling upon the exposed porous cup atmometer, by preventing the 

 entrance of water from the cup into the reservoir, while movement 

 in the opposite direction may proceed as usual. Moore. 



Livingston, B. E., Relation of soil moisture to desert 

 Vegetation. (Bot. Gaz. L. p. 241—256. fig. 1—4. Oct. 1910.) 



A contribution to the quantitative knowledge of the relation of 

 environmental conditions to Vegetation at Tucson, Arizona. After 

 a consideration of the relation of soil moisture to other factors and 

 a description of four types of soil involved with their respective 

 plant societies, the methods of determining and representing soil 

 conditions are described. The water-holding powers of the soil were 

 determined by Alling with soil metal cylinders, with perforated 

 bottoms, which were saturated with water and then allowed to 

 drain. From the weight of the dry and saturated soil the water- 

 retaining power is calculated. The actual soil moisture content was 

 also determined by weighing and drying metod. Four graphs, — 

 one for each soil, giving moisture content at two depths and the 

 precipitation record, accompany the article. These graphs bring 

 out the lagging of soil moisture behind precipitation and the close 

 agreement of the water retaining power of a soil with the character 

 of its Vegetation. The results indicate that the water-holding power 

 Warrants it being used as a soil criterion for habitat studies. 



Moore. 



Mathey, A., Un coin de l'Oranie. Maquis, broussailles et 

 for€ts. (Ann. Sc. agronom. franc. et etrang. 1909. I. p. 412—435. 

 IL p. 13-80, 112—137, 189—268. fig.) 



Importante etude de la Vegetation forestiere du Teil oranais 

 et du vaste massif bois£ d' Ammi-Moussa. Les forets sont classees 

 d'apres la nature des terrains qui les hebergent et l'auteur s'attache 

 surtout ä mettre en evidence leur mode d'evolution, progressive ou 

 regressive, et ä determiner par l'analyse des associations veg^tales 

 les conditions de leur amenagement et de leur reconstitution. 



J. Offner. 



Namyslowski, B. von, Studium ü ber d en B1U tenbau von 

 Delphinium Consolida L. auf Grund teratologischer Be- 

 funde. (Acta Horti Botanici univers. imper. Jurjevensis. XII. 

 p. 30—38. mit Figuren.) 



Alle Beobachtungen in der Literatur verzeichnet, sowie vom 

 Verf. gefundene Pelorien bestätigen die zuerst von De Ca nd olle 

 ausgesprochene und von Prantl angenommene Anschauung dass 

 das Nektarium aus 2 verwachsenen Blumenblättern besteht. Ein 

 theoretisches Diagramm von Delphinium Consolida wäre aus 2 al- 

 ternierenden Wirtein gebildet, wobei jeder Wirtel aus 5 Elementen 



