Viii CONTENTS 



(2) Incomplete or "basal" solutions with additional organic 



non-nitrogenous materials of known composition. 



Section 8 (Med. 566-588) 157 



(3) Complete media as in (2). 



Section 9 (Med. 589-647) 167 



(4) Additional constituents nitrogenous and of known chemi- 



cal composition. Section 10 (Med. 648-683) 182 



(5) Additional materials of plant origin. Chemical composi- 



tion not known. Section 11 (Med. 684-712) 191 



(6) Additional material of animal origin of unknown chemical 



composition (other than extracts or infusions). 



Section 12 (Med. 713-747) 198 



(7) Media containing animal extracts or infusions in addition 



to commercial digests. 



Section 13 (Med. 748-977) 210 



b. Media containing non-commercial digests. 



Section 14 (Med. 978-1140) 299 



c. Media not containing digests. 



(1) Containing plant derivatives of unknown chemical com- 



position. Section 15 (Med. 1141-1228) 329 



(2) Containing animal derivatives. 



Section 16 (Med. 1229-1376) 355 



(3) Containing extracts of soil, ashes, etc. 



Section 17 (Med. 1377-1394) 402 



VI. KEY TO THE SUB-GROUPS OF REVERSIBLY SOLID AGAR MEDIA. 



Group II (Med. 1395-2198) 408 



A. Sub-group IIA. Key to media containing water and agar only. 



(Media 1395-1401) 408 



B. Sub-group IIB. Key to sections of liquefiable agar media, with all con- 



stituents (other than agar) inorganic. (Media 1402-1430) 411 



1. Nitrogen present only as free N2. Section 1 (Med. 1402-1410) 411 



2. Nitrogen supplied as ammonium salts. 



Section 2 (Med. 1411-1424) 413 



3. Nitrogen supplied as nitrites and nitrates. 



Section 3 (Med. 1425-1430) 417 



C. Sub-group lie. Key to sections of liquefiable agar media containing or- 



ganic materials (in addition to agar). 



(Med. 1431-2198) 419 



1. Composition of all added constituents known. 



a. Inorganic nitrogen supplied. Section 1 (Med. 1431-1495) 419 



b. Organic nitrogen supplied. Section 2 (Med. 1496-1519) 436 



2. Composition of some of the added constituents not known. 



a. Agar media containing commercial digests; other materials of 



known composition. Section 3 (Med. 1530-1596) 443 



b. Agar media containing commercial digests together with ma- 



terials of plant or soil origin. 



Section 4 (Med. 1597-1627) 461 



