(3i8) 



7029-7036. A series of specimens representing the former use of cotton fiber in the 

 making of electric light carbons. 



7029. Long staple cotton. — A superior variety of cotton, consisting of the hairs 



from the seeds of one or more species of Gossypium (Malvaceae — Mallow 

 Family). Native of tropical America and cultivated for its fiber. 



7030. Cotton squirt mixture. — A liquid with which the cotton is treated to prepare 



it for carbonizing. 



7031. Coil fiber. — The cotton fiber coiled, ready for shaping for the lamp. 



7032. Shaped fiber. — The cotton fiber in shape to go in the lamp. 



7033. Untreated carbon film. — The carbonized fiber before the final treatment. 



7034. Treated carbon film. — The film properly mounted for enclosing in the glass 



bulb. 



7°35- 



7036. Finished cotton carbon incandescent lamp. 



7037-7054 represent the modern Tungsten lamp, which has entirely replaced those 

 in which wood carbons were used. Same donors. 



7055. Pacury guazu charcoal. — From Platonia insignis Mart. {Guttiferae — 



Gamboge Family). Native of tropical America. From Paraguay. 



7056. Guavira guazu charcoal. — From Campomanesia crenata Berg. (Myrtaceae — 



Myrtle Family). Native of tropical America. From Paraguay. 



7057. Araza charcoal. — From the wood of the guava, Psidium guajava. (Same 



family). Same locality. 



7058. Arrijan charcoal. — From Blepharocalyx cuspidatus Berg. (Same family). 



Same locality. 



7059. Ybapanu charcoal. — From Eugenia cauliflora Miq. (Same family). Same 



locality. 



7060. Yba hay charcoal. — From E. edulis B. & H. Same locality. 



7061. Yba Paroity charcoal. — From E. Michelii Lam. Same locality. 



7062. Guaviyu charcoal. — From E. pungens Berg. Same locality. 



7063. Sapiranguy charcoal. — From a species of Tabernaemontana (Apocynaceae 



— Dogbane Family). Native of tropical America. From Paraguay. 



7064. Guayabi hu. — From Patagonula americana L. (Boraginaceae — Borage 



Family). Native of tropical America. From Paraguay. 



7065. Apaterebi hu charcoal. — From Cordia alliodora Cham. (Same family). 



Same locality. 



7066. Taruma guazu charcoal. — From Vitex montevidensis Cham. (Verbenaceae — 



Verbena Family). Native of tropical America. From Paraguay. 



7067. Lapacho crispo charcoal. Charcoal from Tabebuia flavescens B. & H. 



Native of Paraguay. 



7068. Urandey mi charcoal. — From Astronium Urundeuva Engl. (Carduaceae — 



Thistle Family). Native of tropical America. From Paraguay. 



7069. Brazilian Indian tinder. — A tinder used by the Brazilian Indians in making 



fire by friction with wooden implements. Acquired by Weiss & Schmidt on 

 the upper Rio Negro, Brazil. 



