52 JOUKNAL OF THE MiTCHELL SoCIETY \_AugUSt 



same large group of stone-carvings found scattered over a wide 

 area which is bounded by the Orinoco, the Atabapo, the Rio 

 Negro, and the Cassiquiare. While Alexander von Humboldt 

 mentions only two petroglyphs from the region of Caicara, 

 "el sol" and "la luna," of which the writer saw only "el sol," 

 neither he nor any other traveler who ever touched that point 

 seem to have known any of the stone-carvings found by the 

 writer. These newly discovered petroglyphs occur on the banks 

 of the Orinoco and in the adj acent forest. They may be divided 

 up into three distinct groups, one representing the simplest type 

 and consisting of almost geometrical circles, one in the other, 

 the center of the most inner one being hollowed out; another 

 group of a more complicated type and of more fantastic 

 design, of which only one figure was found ; and a third group 

 that evedently represents the highest type in the development 

 of this art of petroglyphy and that comprises "el sol," that was 

 already known to Humboldt, and the new petroglyph that was 

 discovered by the writer, namely "el tigre." All these petro- 

 glyphs are supposed to have been produced in prehistoric times. 

 As to their meaning there exists quite a number of theories. 

 The writer holds the view, on the base of extended studies in 

 f etichism, that they represent records of earlier and later fetich- 

 ism, while they have served, at the same time, as an indirect 

 means to develop the art of sculpture that grew out of the art 

 of petroglyphy. 



The Work of the State Laboratory of Hygiene, C A. Shore. 



8o7ne Reduction Phenomena in Hydroids, H. V. Wilson. 



Some New Questions Concerning Ventilation, C. W. Edwards. 



Solution of the Draftsman's Difficulty, John F. Lanneau. 



George Marcgrave, the First Student of American Natural 

 History, E. W. Gudger. 



George Marcgrave was a member of the Dutch expedition 

 to Brazil under Johann Moritz, Count of Nassau-Siegen, during 

 the first half of the seventeenth century. He assiduously 



