1908.| Agents in the Oxidation of Amorphous Carbon. 259 
I have to express my indebtedness to my colleague, Dr. Morris-Airey, for 
much help which he has given me in the preparation and testing of the 
electrical apparatus employed in this research, and I take this opportunity of 
thanking him for the kind way in which he has always been ready to give me 
the benefit of his assistance in any technical difficulty. 
My obligations are due to the Government Grant Committee of the Royal 
Society for the use of a Zeiss 3 mm., 1-40 apochromatic oil-immersion lens. 
LITERATURE. 
1. Beijerinck, ‘Ueber die Bakterien, welche sich im Dunkeln mit Kohlensaure als 
Kohlenstoffquelle ernadhren kinnen,” ‘Cent. f. Bakteriologie, abt. II, vol. 11, 
1903 | 
2. Brown, A. J., “On the Existence of a Semi-permeable Membrane enclosing the 
| Seeds of some of the Graminez,” ‘Annals of Botany,’ vol. 21, 1907. 
3. Hall, “The Effect of Plant Growth and of Manures upon the Retention of Bases by 
| the Soil,” ‘ Roy. Soc. Proc.,’ B, vol. 77, 19085. 
4. Kaserer, “Die Oxydation des Wasserstoffes durch Mikro-organismen,” ‘Cent. f. 
Bakteriologie,’ abt. II, vol. 16, 1906. 
5. Nageli, “Ueber oligodynamische Erscheinungen in lebenden Zellen, mit einem 
Vorwort von 8. Schwendener und einem Nachtrag von C. Cramer,” ‘Denkschriften 
d. Schweizerischen Naturforschenden Gesellschaft,’ vol. 33, 1893. 
6. Potter, “On the Decomposition of Oxalic Acid by Bacteria,” ‘ Univ. of Durham Phil. 
Soc. Proc.,’ vol. 2, 1903. 
ve “Bacteria as Agents in the Oxidation of Amorphous Carbon,” Brit. Assoc., 
Cape Town, 1905. 
8. “On a Bacterial Disease of the Turnip (Brassica mae “Roy... Sec. Procs: 
vol. 67, 1900. 
PD: “On the Occurrence of Cellulose in the Xylem of needy Stems,” ‘ Annals of 
Botany,’ vol. 18, 1904. | 1 
10. Renault, “Recherches sur les Bactériacées Fossiles,” ‘Annal. d. Sci. Nat.,’ Bot., 
series 8, vol. 2, 1895. 
1l. Stoklasa, ‘‘ Ueber die anaérobe Atmung der Samenpflanzen und iiber die Isolierung 
der Atmungsenzyme,” ‘ Ber. d. Deut. Bot. Gesell.,’ vol. 25, 1907. 
12. ~——— “ Der anaérobe Stoffwechsel der hoheren Pflanzen und seine Beriouine, zur 
. alkoholischen Garung,” ‘ Beit. z. Chem. Physiol. u. Path. v. Fr. Hofmeister,’ 
vol. 3, 1903. 
13. True and Oglevee, “ The Effect of the Presence of Insoluble Substances on the Toxic 
Action of Poisons,” ‘ Botanical Gazette,’ vol. 39, 1905. 
VOL. LXXX,—B, xX 
