378 EIBLIOGEAPHY. 



gigkeit der Keimung von der Temperatur. Pringsheim's Jalir- 

 biicher fur Wiss. Botanik. Bd. ii. pp. 338-377. 



The author's inquiries, conducted chiefly in the winters 1857-8 

 and 1858-9, were instituted with a view to determine the extremes 

 of temperature at which the seeds of various species would germi- 

 nate, the rate of development of the organs as affected by diverse 

 or constant temperatures, and the effect of a fixed temperature on 

 the different stages of development of germinating plants. The 

 results of experiments (upon Maize, Barley, Wheat, Phaseolus 

 multiflorus, Pea, Bean, Gucurbita JPepo and other species) are 

 detailed — (1) on the change in the rate of extension of germi- 

 nating rootlets and ascending organs under like temperatures : 

 (2) the temperature most favourable to rapid development of 

 the germ: (3) the minima and maxima at which germination 

 takes place : and (4) the dependence of ulterior development on 

 temperature. 



A criticism upon A. DeCandolle's theory of the relation of 

 vegetation to temperature, (Bibl. Geneve, Mars, 1860, and ' Geog. 

 Bot.' i. 51), and a proposed formula for the expression of the 

 empirical relation of temperature to vegetation, are added to the 

 above details. 



Savi, Pieteo. — Nota sulla morfologia e micrografia degli organi delle 

 Cicadacee. II Nuovo Cemento, xii. 1860. Ext. pp. 8. 



Schacht, H. — Der Baum. Studien iiber Bau und Leben der hoheren 

 Gewachse. 2nd edition, 4 plates and 227 wood engravings. 8vo. 

 Berlin, 1860. 



De Maculis in plantarum vasis cellulisque lignosis obviis. An. 



Sc. Nat. Bot. xiii. pp. 218-235. 



Sciiafenee, Dr. — Zur Entwicklungsgeschichte des Embryos und 

 Samens von Leucojum vernum. Flora, 1860, 577-582. With 

 1 plate. 



Appendages of delicate membranous texture are described, 

 developed from the germinal vesicle and projecting beyond the 

 apex of the embryo sac. They are lost when the embryo is 

 matured. 



Schenk, Peoe. — Ueber Parthenogenesis im Pflanzenreiche. Wiirz. 

 Nat. Z. Bd. i. pp. 85-9. 



The result of experiments, chiefly upon Cannabis saliva and 

 Mercurialis annua. No female flower, which had been cut oft' from 

 the access of pollen, perfected fruit. 



Sciilechtendal, D. F. L. v. — Nachtrag zur Geschichte der Sonnen- 

 blume {Heliantlius annuus, L.) Bot. Z. 1860, pp. 349-350. 



Abnorme Weizenahren, Bot. Z. 1860, 381-3. _ 



Sciilotthauber, Dr. — Zunahme der Temperatur in der unteren 

 Region der Atmosphare, sowie Erklarung und Einfluss dieser 

 Erscheinung auf die Vegetation. Bonplandia, 1860, pp. 371-3. 



ScnoENEEELo, W. — Sur le mode de Vegetation de Y Aldrovanda vesi- 



