Floristik, Geographie, Systematik etc. 
367 
Desf. (IX. Ber. der zürcherischen bot. Ges. Zürich, p. 110—112, 
in Ber. der Schweiz, bot. Ges. XV. 1905.) 
Bei Gelegenheit der Studienreise von Chodat nach Spanien 
fiel dem Verf. auf, dass Sanguisorba ancistroides Desf. genau am 
gleichen „Wurzelort” (nach Oetlli) wächst wie Potentilla caulescens 
L. an den Churfirsten (Schweiz), eine Beobachtung, die der Ref. 
nach seinen Erfahrungen bei Oran vollauf bestätigen kann. 
H. Brockmann-Jerosch (Zürich). 
Petitmengin. Primulacees chinoises de l’herbier de l’Aca- 
demie internationale de Geographie botanique. (Bull. Acad. 
int. Geogr. bot. T. XVI. p. 220—225. 1907.) 
Cette enumeration comprend 30 especes, dont 3 sont nouvelles: 
Lysimachia remota Petitmengin, L. Bodinieri id. et L. Leveillei id. 
J. Offner. 
Rougemont, F. de, Notes botaniques. (Rameau de Sapin. N ü . 5. 
Organ du Club Jurassien. Neuchätel 1907.) 
Verf. fiel es auf, dass Gentiana lutea L. im Sommer 1906 im 
Waadtländer und im Solothurner Jura, sowie in den Kalkalpen 
des untern Wallis ganz allgemein sehr reichlich blühte, wie das 
der Verf. seit Jahren nicht beobachten konnte. 
Ein Abkömmling eines Aster alpinus, den der Verf. kultivierte, 
wurde vielköpfig, also identisch mit der Form, die Brügger als 
Aster Garibaldii beschrieb. M. Brockmann-Jerosch (Zürich). 
Russell, E. J., The Relation between the Geographical Po¬ 
sition and the Productive Capacity of Land. (Journ. Man¬ 
chester Geographical Soc. p. 28—42, 6 Figs. 1907.) 
Of the many factors which go towards making the growing of 
crops profitable, the author discusses one group, the influence of 
elevation, slope and other factors of the locality. The observations 
were carried out mainly in the south of England (Kent and Surrey), 
and the conclusions apply more especially to the topography of that 
area, viz., an extensive plateau (The Downs, etc.) with valleys. The 
plateau receives only rain-water, is exposed to winds, and is liable 
to drought, hence its is frequently heath, or grassland and not 
highly productive. The valley-slope receiving soil-water with dissol- 
ved salts, in addition to rain-water, is more constantly moist and 
the conditions are frequently favourable to high productiveness in 
farm crops, fruit and hops. The valley-bottom has the greatest water- 
supply; sometimes it is fertile, or it may be more or less marshy, 
consequently is unproductive from the economic point of view. The 
percolation and surface drainage of water effects a transference of 
salts and the finer soil from the plateau downwards, so that fertility 
increases reaching its maximum in the valley if this is not excessi- 
vely wet and if the soluble matters do not collect in excess. Some 
useful statistics show the Variation of temperature in a valley. In the 
valley-bottom the daily ränge of temperature is greater than on the 
slope, and the risk of early and late frost is increased; this is the 
case at Wye (Kent) with a difference of 60 M. altitude. If a river 
passes down the valley, there is a narrow protected zone along its 
banks. W. G. Smith. 
