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6297- Siam Catechu, or cutch— An extract prepared by boiling in water the heart- 

 wood of Areca Catechu (L.f.) Willd. (Palmae— Palm Family). Native 

 of tropical Asia. Presented by Parke, Davis & Company. 



6298. Another sample of the same. Presented by H. H. Rusby. 



6299. Quebracho extract. — An extract obtained by boiling in water the wood and 



bark of Quebrachia Lorentzii (Griseb.) Engler, and other species of Quebrachia 

 {Anacardiaceae — Sumac Family). Native of Argentine and adjacent 

 regions. Presented by H. H. Rusby. 



6300. Manna, in sorts. — An inferior grade of the sugary exudation obtained by 



incising the bark of Fraxinus Ornus L. (Oleaceae — Olive Family). Native 

 of southern Europe and cultivated. Presented by H. H. Rusby. 



6301. Crude gambir. Pale Catechu. — The crude extract made by boiling in 



water the leafy twigs of Ourouparia Gambier (Roxb.) Baill. {Rubiaceae — 

 Madder Family). Native of tropical Asia and cultivated. Presented 

 by H. H. Rusby. 



6302. Kavi extract. — Another form of the same. From Siam, through the Field 



Museum of Natural History. 



6303. Cube gambir. Khan. Siet-thet. — A superior grade of the preceding, 



produced in British India and cut into small cubes. Presented by H. H. 

 Rusby. 



6304. Japanese agar-agar. — A gum-like product extracted from the plants of 



species of Eucheuma, Gelidium, and other seaweeds. Native of the 

 ocean of eastern Asia. Presented by Lehn & Fink. 



6305. Another sample of the same. Presented by Merck & Company. 



6306. Raw linseed oil (See No. 1648). Presented by the National Lead Com- 



pany. 



6307. American linseed oil. — The preceding oil expressed from American-grown 



flax-seed. Same donor. 



6308. Refined linseed oil. — The same, freed from its impurities. Same donor. 



6309. "AA" linseed oil. — A highly purified grade of the same. Same donor. 



63 10. Boiled linseed oil. — The same oil, improved for use by boiling. Same donor. 



63 1 1. Refined castor oil. Oleum Ricini. — The highly purified fixed or fatty oil 



expressed from the ripe seeds of Ricinus communis L. (See No. 1656). 

 Presented by Baker & Company, of New York. 



6312. Croton oil. Oleum Tiglii (See No. 1663). 



63 13. Refined olive, or sweet, oil. Oleum Olivae.— -The highly refined oil expressed 



from ripe olives (See No. 1696). 



6314. Crude camphor. — An aromatic substance obtained by distillation with steam 



from the wood of the root and portions of the trunk of Cinnamomum 

 Camphora (Nees) Engler (Lauraceae — Laurel Family). Native of 

 eastern Asia, on the mainland and islands. The specimen shows the form of 

 tub in which the crude camphor is imported. Presented by Baker & 

 Company, of New York City. 



6315. Refined camphor. — The preceding substance, refined by redistillation. 



Same donor. 



