208 
THE PLANT WORLD. 
Muhlenberg, H. Catalogus plantarum Americae septentrionalis. Lan¬ 
caster. 1813. 
Muller, H. The fertilisation of flowers. (English translation by 
Thompson.) London. 1883. 
Nuttall, Thos. The sylva of North America. Philadelphia. 1842. 
Pound, R., and Clements, F. E. The phytogeography of Nebraska. 
Lincoln. 1898. 
Pursh, F. Flora Americae septentrionalis. London. 1814. 
Rafinesque, C. S. Annals of Nature. Lexington. 1820. 
Schenck, H. Die Biologie der Wassergewachse. Bonn. 1886. 
Schimper, A. F. W. Ueber Bau und Lebensweise der Epiphyten 
Westindiens. Bot. Centralbl. 17. 1884. 
Die indo-malayische Strandflora. Bot. Mittheil. aus den Tropen. 
Heft 3. 1891. [Translation, Oxford, 1903-4.] 
Pflanzengeographie auf physiologischer Grundlage. Jena. 1898. 
[Translation, Oxford, 1903-4.] 
Schouw, J. F. Grundziige einer allgemeinen Pflanzengeographie. 
Berlin. 1823. 
Sprengel, C. K. Das entdeckte Geheimniss der Natur in Bau und 
Befruchtung der Blumen. Berlin. 1795. 
Stahl, E. Ueber den Einfluss des sonnigen odor schattigen Stand- 
ortes auf die Ausbildung der Laubblatter. Jen. Zeitschr. f. 
Naturw. 16. 1883. 
Einige Versuche uber Transpiration und Assimilation. Bot. Zeit. 
1894. 
Torrey, J. A flora of the northern and middle portions of the United 
States. New York. 1824. 
Volkens, G. Die Flora der agyptisch-arabischen Wiiste. Berlin. 
1887. 
Warming, E. Rhizophora Mangle. Bot. Jahrb. 4. 1883. 
Om Gronlands vegetation. Meddeleeser, om Gronland. 12. 1887. 
Lehrbuch der oekologischen Pflanzengeographie. Berlin. 1896. 
Wittrock, V. B. Om snons och isens flora. Nordenskiold’s studier 
och forskningar af mina resor i hoga norden. Stockholm. 1883. 
THE COWTHORPE OAK.* 
There is probably no living tree about which so much has been 
said and written as about an oak at Cowthorpe, near Wetherby, 
in England. It is larger in diameter than any other oak of which 
there are records. For more than two centuries it has held its place 
as king of oaks. From time to time during that period it has 
been measured and described by scientists who have left their 
descriptions. 
* Clayton, J., Trans, and Proc. Bot. Soc. Edin., 22: 396. 1904. 
