INDEX TO CONTRIBUTORS. 383 



PAGB 



184. Remarks on a new levelling instrument. 



186. On the discovery of the two satellites of Mars. 



188. Remarks on the nebular hypothesis. 



189. Remarks on the rings of Saturn. 



190. Remarks on asymmetry, 



192. Remarks on the orbits of Deimos and Phobos. 

 199. Remarks on the transit of Mercury. 



W. Harkness. [interval of time. 



64. Remarks on Mayer's method of determining a definite 

 6*7. Remarks on the regulation of the Hudson. 

 68. On the U. S. Expedition to Hobart Town to observe 

 the transit of Yenus. 



68. On the methods of measuring the inequalities of pivots. 



69. On the U. S. Expedition to Hobart Town to observe 



the transit of Yenus. 



123. Remarks on observations of meteors. 



123. Remarks on Ritchie's liquid compass. 



192. Remarks on spectra of comets and meteors. 



199. Remarks on intersections of circles and spheres. 



199. Remarks on the transit of Mercury. 



201. On the velocity of light and the solar parallax. 



F. Y. Hayden. 



18*7. Remarks on the recent history of the Great Salt Lake. 



J. Henry. 



(45). Appendix No. IX. On sound in relation to fog signals. 

 19. Remarks on habits of observation. 

 22. On audition. 



25. Remarks on early surveys for the Erie Canal. 



26. Remarks on the distribution of mammals. 

 35. On the glacial theory. 



3*7. On fog signals a.nd abnormal conditions of sound. 



39. Communicates two letters from Mr. A. C. Ross. 



40. Remarks on Mosher's experiments on latent impi^essions. 

 40. On electricity engendered by the driving belt of ma- 

 chinery, [per plates. 



43. Remarks on magnetic condition of iron facing for cop- 



48 Remarks on unconscious cerebration. 



50. Remarks on rainfall observations in high towers. 



