yj Contents. 



Papers Published — Continued. pa.qb 



9. Wm. H. RoEVER.— Geometrical constructions of the lines 

 of force, proceeding from (a) two parallel electrified 

 lines, (&) two electrified points.— Issued June 30, 



1896 ...............:.. 201 



10. J. B. S. Norton.— A study of the Kansas Ustilagineae, 



especially with regard to their germination.— Plates 

 XXV.-XXIX.— Issued November 9, 1896 229 



11. Milton Updegraff. — Flexure of telescopes. — Issued 



November Si, 1896. 243 



12. Wm. H. Roever. — Geometrical properties of the lines of 



force proceeding from (a) a system consisting of an 

 electrified plane and an electriSed line parallel to the 

 plane, (6) a system consisting of an electrified plane 

 and an electrified point.*— Issued January 19, 1897... 273 



13. Henry S. Pritchett. — Results of double star observa- 



tions made with the equatorial of the Morrison Obser- 

 vatory.— Issued April 22, 1897 299 



14. Charles Robertson. — North American bees. — Descrip- 



tions and synonyms. — Issued May 7, 1897 315 



16. Charles R, Keies. — Relations of the Devonian and Car- 



boniferous in the upper Mississippi valley. — Issued 



Junel,1897 357 



16." Frank Collins Baker. — Critical notes on the Muri- 

 ' cidae. — Issued June 12,1897 371 



17. Robert Combs. — Plants collected in the district of Cien- 



fuegos. Province of Santa Clara, Cuba, in 1895-1896. — 

 Map, and Plates XXX.-XXXIX.— Issued September 



13, 1897. 393 



1 8 William Trelease. — An unusual phyto-bezoar. — Plate 



XL.— Issued November 30, 1897 493 



19. Julius Hurter.— A contribution to the herpetology of 



Missouri.— Issued December 31, 1897 499 



20. Title-Page, prefatory matter and index of Vol. VII. 



Record from July 1, 1894 to Dec. 31, 1897.— Issued 



February 21, 1898. 



List of Authors , 5Q5 



General Index 505 



Index to Genera 5^0 



* See note by author, on p. iii. 



