TABLE OF CONTENTS. 



Article I. (1441.) Rksearches on the Attainment of Very 

 Low Temperatures. By Morris W. Travers, 

 D. So. Part I. 1904. Pp. title, 32. 



Article IL (1444.) A Catalogue of North American Dip- 

 tera (or Two-winged Flies). By J. M. 

 Aldrich. 1905. Pp. title, 680. 



Article III. (1477.) Researches in Helminthology and Para- 

 sitology BY Joseph Leidy, M. D., LL. D. 

 Edited by Joseph Leidy, Jr., M. D. 1904. 

 Pp. 281. 



Article IV. (1543.) Index to the Literature of Gallium, 

 1874-1903. By Philip E. Browning, Ph. D. 

 1904. Pp. 12. 



Article 



Article 



V. (1544.) Index to the Literature of Germanium, 

 1886-1903. By Philip E. Browning, Ph. D. 



1904. Pp. 8. 



VI. (1571.) Index to the Literature of Indium, 

 1863-1903. By Philip E. Browning, Ph. D. 



1905. Pp. 15. 



(V) 



