NOTES 171 



19. (p. 30). A very good critical description, both morphological and physiological, of 



the known species of bacteria is given by LEHMANN and NEUMANN (note 3). 

 The pathological forms are treated most fully, but the work may be strongly 

 recommended to all students. 



20. (p. 30). COHN'S Systematic Classification of the Bacteria in Beitr. z. Biol. d. Pfl. 



vol. ii. 



21. (p. 32). Attempts at new systems introducing new genera have been recently pub- 



lished by A. FISCHER (loc. cit., note 9), by MIGULA in Engler and Prantl's Die 

 natiirlichen Pflanzenfamilien, Lief. 129, and by LEHMANN and NEUMANN, loc. 

 cit., note 3. The author offers the arrangement given in the text for further 

 criticism and consideration. 



22. (p. 39). For other pathogenic micro-organisms and fungi see FLUGGE (note 3), 



where also figures and literature are given. 



23. (p. 45). The methods and technique in the bacteriological analysis of air, water, 



earth, food-stuffs, &c., will be found in the works cited in note 3, and in 

 every text-book of hygiene. The beginner will find a concrete example of 

 method and results in : HESSE, Ueber quantitative Bestimmung der in der 

 Luft enthaltenen Keime, Mitt, aus dem kaiserl. Gesundheitsamte, vol. ii, 1884; 

 MlQUEL, Des organismes vivant de 1'atmosphere, Paris 1883 ; Roux, Precis 

 d'analyse microbiologique des eaux, Paris 1892 ; WOLFFHUGEL, Erfahrungen 

 ii. den Keimgehalt brauchbarer Trink- und Nutzwasser, Mitt. a. d. Reicbs- 

 gesundheitsamt, 1886; LOFFLER, Das Wasser u. die Mikro-organismen, Hand- 

 buch fur Hygiene, vol. i, 2. Abt., 1896. 



24. (p. 48). This mode of classification, as may be seen in these lectures, saves many 



a long description. 



25. (p. 50). A very readable description of the long conflict over the problem of 



spontaneous generation is given in LOFFLER'S lectures (note 4), and also fully 

 in LAFAR'S Technical Mycology ; PASTEUR'S classical work on the matter is 

 Memoires sur les corpuscules qui existent dans 1'atmosphere : examen de la 

 doctrine des generations spontanees, Annales de Chimie et Physique, 1862, 

 3. serie, vol. Ixiv. It has appeared also in German (by WIELER) in OSTWALD'S 

 Klassiker der exakten Wissenschaften, No. 39, Leipzig (Engelmann). 



26. (p. 51). This rash statement has been made by FERMI, Centralbl. f. Bakt, 2. Abt. 



vol. ii, 1896. 



27. (pp. 52, 53). NENCKI und SCHEFFER, Ueber d. chemische Zusammensetzung der 



Faulnissbakterien, Beitrage z. feiol. d. Spaltpilze, edited by NENCKI, Leipzig 

 1880 (reprint from the Journal f. prakt. Chemie, neue Folge, vols. xix and xx) ; 

 also KAPPES, Analysis of Mass-cultures of the Thrush Fungus and some 

 Bacteria, Leipzig 1889; CRAMER, Die Zusammensetzung der Cholerabazillen, 

 Archiv f. Hygiene xxii, 1895. 



28. (pp. 53, 56). NAEGELI, Ernahrung der niederen Pilze durch Kohlenstoff- und Stickstoff- 



verbindungen, Untersuchungen iiber niedere Pilze, 1882 (also in the Sitzungsber. 

 d. math.-phys. Klasse d. Miinchener Akad. der Wissensch. 1879). See also 

 particularly BEYERINCK, Over lichtvoedsel en plastisch voedsel van Licht- 

 bakterien, Versl. en Mededel. der Amsterdamer Akad. d. Wissensch., Naturwiss. 

 Abt., 2. Serie, vol. vii, 1890; here will be found also the division into pepton, 

 amido, and ammonia bacteria ; FRANKEL, Beitrage z. Kenntniss des Bakterien- 

 wachstums auf eiweissfreien Nahrboden, Hyg. Rundschau iv, 1894. The table 

 on p. 55 is from personal experiments. 



