394 Siedentopf: Die Vorgeschichte der Spiegelkondensoren. XXIV, 4. 



3) Siedentopf, H., Dunkelfeldbeleuchtung und Ultramikroskopie (Zeitschr. 



f. wiss. Mikrosk. Bd. XXIV, 1907, p. 13—20). 



4) Siedentopf, H., Paraboloidkondensor. Eine neue Methode zur Sichtbar- 



machung und zur Momentmikrophotographie lebender Bakterien etc. 

 [insbesondere auch für Spirochaete pallida] (Zeitschr. f. wiss. Mikrosk. 

 Bd. XXIV, 1907, p. 104—108). 



5) QuECKETT , J. , A practical treatise on the use of the microscope. 



Third edition. London (H. Bailiiere) 1855; p. 220—221. 



6) GoRiNG, C. R. , a. Pritchakd, A., Micrographia. London (Whittaker 



& Co.) 1837. 



7) Davis, G. E., Practical MicroscopJ^ London (David Bogue) 1882; p. 76. 



8) Wenham, f. H. , On a raethod of illuminating opaque objects under 



the highest powers of the microscope (Trans. Micr. Soc. London, 

 n. ser., vol. IV, 1856, p. 55—60). 



9) CoTTON, A., et MouTON, H., Nouveau procede pour mettre en evidence 



les objets ultramicroscopiques. 



a. (Compt. Rend. t. CXXXVI, 1903, p. 1657—1659.) 



b. (Soc. franc. de physique, 1903, p, 54 — 56.) 



10) QuECKETT, J., loc. cit. p. 135. 



11) Wenham, F. H., On the illumination of transparent microscopic objects 



on a new principle, read 17 April 1850 (Trans. Micr. Soc. London, 

 ser. 1, vol. III, 1852, p. 83—90). 



12) a. QuECKETT, J., loc. cit. p. 134. 



b. Carpenter, W. B., The microscope and its revelations. Eighth edition, 



edited by W. H. Dallinger. London (J. and A. Churchill) 1901; 

 p. 316). 



c. Shadbolt, G. (Trans. Micr. Soc. London, ser. 1, vol. III, 1852, 



p. 132). 



13) Spitta, E. J., Microscopy. London (John Murray) 1907; p. 174. 



14) Wenham, F. H. , On the theory of the illumination of objects under 



the microscope, with relation of the aperture of the objectglass, and 

 properties of light; with practical methods for special diflferences of 

 texture and colour (Quarterly Journal Micr. Science vol. II, 18.54, 

 p. 145—158). 



15) Harting, P., Das Mikroskop. Deutsche Originalausgabe von W. Theile. 



Braunschweig (Friedr. Vieweg & Sohn) 1859; p. 220. 



16) Edmunds, J., Note on a new paraboloid Illuminator for use beneath 



the microscope stage. Also note on the resolution of Podura scale 

 by means of the new Paraboloid (The monthly micr. Journal: Trans. 

 Roy. Micr. Soc. London vol. XVIII, 1877, p. 78—86). 



17) Pelletan, J., Le microscope. Paris (G. Masson) 1876; p. 109. 



18) Beale, L. S., How to work with the microscope. Fifth edition. London 



(Harrison) 1880; taf. 16, fig. 3. 



19) Carpenter, W. B. , The microscope and its revelations. Seventh 



edition by W. H. Dallinger. London (J. and A. Churchill) 1891 ; 

 p. 269. 



20) Reichert, C. , Neuer Spiegelkondensor zur Sichtbarmachung ultra- 



mikroskopischer Teilchen (Österr. Chem.-Zeitg. Bd. X, 1907, p. 5—7). 



