[178] Tea & Coffee Trade Jour., 1917 (vol. xxxiii: pp. 552–55).

[179] Loc. cit. ([see 175]).

[180] Tea & Coffee Trade Jour., 1911 (vol. xx: p. 34).

[181] Pharm. Weekbl. voor Nederl., 1899 (no. 13).

Apoth. Ztg., 1899 (p. 14).

[182] Jour. Assoc. Off. Agri. Chem., 1920 (vol. iii: p. 501).

[183] Blyth, Wynter. Foods, 1909 (p. 359).

[184] Petermann. Bied. Zentr., 1899 (vol. ii: p. 211).

[185] Association of Official Agricultural Chemists. Sept., 1920.

[186] Association of Official Agricultural Chemists, Sept., 1920.