SOURCES OF THE MATERIAL. 13 



They started from New York in August 1910 and went direct to Georgetown. 

 After collecting in the Demerara and along the coast at Georgetown and con- 

 ducting experiments in the regeneration on various species of the Gymnotidae 

 they ascended the Demerara to canal Number Two. They went through the 

 canal to a tributary of Hubabu Creek, descended to the Demerara and returned 

 to Georgetown. They also ascended the Demerara to Wismar and crossed over 

 to the Essequibo at Rockstone. After collecting on Gluck Island in the Esse- 

 quibo and in a tributary of the Essequibo at the railway crossing between 

 Rockstone and Wismar they returned to the coast. 



The Colombian Reconnaissance. 



Preliminary notes of my reconnaissance in Colombia have been published 

 in Indiana University Studies 16 and 18. A detailed account will appear in 

 the Memoirs of the Carnegie Museum. I entered Colombia at Cartagena in 

 December 1911, and left from the same port in April 1912. From Cartagena 

 I went to Soplaviento on the Dique and to Calamar on the Magdalena; from 

 Calamar up the Magdalena River by steamer to La Dorado, collecting at various 

 stopping places, Barbosa, El Blanco, Canaletal, Puerto Wilches, Penas Blancas, 

 Puerto Berrio. From La Dorado, the route was by rail to the upper part of 

 the Magdalena, collections being made on the way at Honda, especially in Bernal 

 Creek. The upper part of the Magdalena was followed to Girardot, where exten- 

 sive collections were made. From Girardot, the route led first over the western 

 rim of the plain at an elevation of about 8800 feet to Bogota, on an elevated 

 plain among the eastern Cordilleras; collections were made on the plain near 

 Chapinero, north of Bogota, and at Madrid, near the western margin of the plains 

 of Bogota. A return was made to Girardot, from which via Chicoral to Quatro 

 Esquinas, Ibague\ Toche, across the Quindio Pass of the central Cordilleras, at 

 an elevation of 11,200 feet, to Boquia, Piedra Moler, and Cartago near the 

 Cauca River. Up the Cauca Valley via Paila, Buga La Grande, Buga to Cali, 

 collections being made at Paila and at Cali, and in the Cauca near Cab. 



After collecting at Caldas (elevation of 3722 feet), the valley of the Dagua 

 was descended, collections being made at Cisnero (1046 feet), at Cordova (120 

 feet), and in tide- water. 



From Buenaventura, on the Pacific coast of Colombia, a steamer was 

 taken up the San Juan River to Puerto Negria; thence a dugout carried the 

 Expedition as far as Istmina; collections were made in both the latter places. 

 From Istmina, after a ride of two hours up a little stream, and across the low 



