Footnotes in the original text (page + number). 

[201.1] Nissen, Die Orientation ägyptischer und griechischer Bauwerke, 3 vols.
[201.2] Widlak, Gebräuche der alten Deutschen, Verlag F. M. Lenks, Znaim.  (My emphasis, as also elsewhere.)
[202.1] Kalliese, in Korrespondenzblatt des Gesamtvereins Deutscher Geschichts- und Altertumsvereine 1918, Nr. 7/8 Sp. 7.  Sächsischer Heimatschutz zu Dresden 1928.
[203.1] Das Weltall, journal for astronomy, etc., Treptow Observatory, May 1930.
[205.1] Biedenkapp, Der Nordpol als Völkerheimat.  Verlag Costenoble, Jena 1906, p. 153.
[208.1] Tacitus’ depiction of the idle life of the Germanic men can only apply, insofar as there is any truth in it, to those followers who had left their homeland and now, in the service and in the company of their prince, were leading a knight’s life, which would indeed have been very different from the life of the Roman mercenary as Tacitus knew it.
[209.1] cf. page 106.
[210.1] See for example Nr. 30.
[211.1] Dr. H. Röhrig, Heilige Linien durch Ostfriesland, published by the District Record Office in Aurich, Verlag Friemann, Aurich 1930, 87 pp. A complementary essay, treating the question of chance on a mathematical basis, can be ordered from the author in person, Hannover, Meterstr. 21.
[211.2] Published by the author, Fritz Fricke, Mühlhausen, Thüringen.
[214.1] According to Preuss, Lippischen Flurnamen, 1552 Kötterberg.
[215.1] The note by von Donop in his description of the Lippe district (1790) does not change anything in this respect.
[215.2] Wigand, Corveyscher Güterbesitz, p. 66.
[216.1] Schoten I c. II, p. 277–279.
[219.1] Zeitschrift für vaterl. Geschichte und Altertumskunde, Münster 1880, p. 96.
[233.1] Leichsenring, Opfersteine und heilige Haine Westsachsens.
[233.2] E. Jung, Germanische Götter und Helden in christlicher Zeit, J. F. Lehmann, München 1922.
[235.1] Recent investigations by Dr. Jarmer of Stettin and theology student Hirsch of Strehlen.  Thanks go to the latter for local investigations in Glatz County.
[239.1] As regards Charlemagne’s attempt to take advantage of the signalling system, I read a mention in connection with the Nieheim lookout before my studies of orientation. I should be grateful if the reference were sent to me, as it has slipped my memory.

Notes added by MB, December 2012.

[203.a] The stone circles at Odry, now in Poland.  Stephan, “Vorgeschichtliche Sternkunde und Zeiteinteilung”, Mannus, vol. 7, pp. 211–248.
[203.b] See the German Wikipedia article “Boitiner Steintanz”, which contains links to Timm’s papers.
[208.a] In 9 A.D. a German army led by Arminius (often called Hermann by modern writers) destroyed three Roman legions in the Battle of the Teutoburg Forest.
[220.a] warde = watchtower, building used as lookout. (K. Schiller & A. Lübben, Mittelniederdeutsches Wörterbuch (1880), vol. 5, p. 599.)
[222.a] “bell tree” = Glockenbaum. A wooden mast with a bell at the top, formerly used in rural areas. See Wikipedia for photo and more information (in German).
[222.b] W. G. L. von Donop, Historisch-geographische Beschreibung der fürstlichen Lippeschen Lande in Westphalen, Lemgo, 1790.
[224.a] Presumably August Meier-Böke, author of Urgeschichte des deutschen Volkes (Prehistory of the German People, with a foreword by Teudt) and other books.
[230.a] In Chapter 7 (not on this website).
[231.a] On p. 11 Teudt quotes these words from Matthias Koch (here translated): “For German regions the rule can be assumed that small objects of bronze and gold found in graves, if not Roman, must necessarily be Celtic, because it is repugnant to cultural history to ascribe them to the Germans.”
[232.a] Perhaps: Carl Hessler, Hessische Landes- und Volkskunde, and Emil Schneider, Hessisches Sagenbuch für Schule und Haus.