160 Scientific Intelligence. 



museums of the world. The author describes with all necessary 

 fullness the external appearance of the mass, certain portions of 

 the surface of which seem to correspond in direction to the inter- 

 nal crystalline structure. The Widmanstatten figures are finely 

 developed by etching ; and numerous nodules of troilite were 

 observed. These last have left by Weathering a number of hem- 

 ispherical and cylindrical cavities, which are a characteristic 

 feature of the iron. 



In connection with Dr. Hussak and Dr. Guilherme Florence, a 

 minute study, leading to many interesting results, has been made 

 of the different forms of nickel, iron and associated minerals pres- 

 ent, namely : Kamacite and tsenite ; also cohenite, rhabdite ; and 

 further troilite, schreibersite, chromite and hypersthene. In addi- 

 tion to these species identified, a peculiar feature are small black 

 spherical globules obtained from the rhabdite, which range from 

 0*1 to 0-2 mm in length and from 0*004 to 0*005 mm in thickness. 

 Some of these are hollow spheres and others are developed in suc- 

 cessive layers, like an onion. They have a fused appearance, and 

 it is suggested that they may have resulted from the fusion of the 

 phosphides, which are evidently the first mineralogical element to 

 be individualized in the metallic magma. These metallic globules 

 sometimes show cubic or octahedral crystalline faces. 



The presence of fine etched lines, resembling file markings, is 

 noted in the kamacite, especially in the vicinity of the troilite 

 nodules. Also associated with these are raised lines, similarly 

 arranged ; these are called Bendego lines. They consist of 

 exceedingly delicate, perfectly regular plates of brilliant white 

 metal resembling taenite, that stands out in relief on the etched 

 surface. The various observed direction of these lines are 

 explained as due to twinning, and Dr. Hussak finds evidence of 

 polysynthetic twinning lamellae parallel to the faces of the hexoc- 

 tahedron (421). 



III. Miscellaneous Scientific Intelligence. 



1. American Association for the Advancement of Science. — 

 The forty-sixth meeting of the American Association will be held 

 at Detroit, Michigan, from August 9th to 14th. Dr. Wolcott 

 Gibbs of Newport is the President-elect. The scientific sessions 

 are to be in the Central High School and the hotel headquarters 

 at " The Cardillac." The local Secretary, who has charge of 

 transportation, hotel accommodations, etc., is Mr. John A. Rus- 

 sell, 401 Chamber of Commerce, Detroit. The Permanent Secre- 

 tary is Prof. F. W. Putnam of Salem, Mass. 



The interest of the coming meeting will be largely increased 

 by the fact that the British Association is to meet this summer at 

 Toronto, and it is expected that the members of the A. A. A. S. 

 will go in a body to Toronto to join in welcoming the members 

 of the B. A. A. S. to America. 



