INDEX. 



409 



I. 



Insect Pests, Destruction of, 372. 

 Iron, Magnetization and Demagnet- 

 ization of, '67-5. 



L. 



Length, On the Present State of the 

 Question of the Standards 

 of, 27:;. 

 References, 308. 



Leptoclinium fruticosum, 48. 



Level, Astronomical, New Form of, 

 372. 



Liatris Garberi, 48. 



Light, Wave Lengths, Reference of 

 the Limit of Length to, 370. 



Light, On a Standard for estimat- 

 ing the Amount reflected by 

 various Substances, 223. 



Lindheimera Mexicana, 34. 



M. 



Mechanical Attachment for Equa- 

 torial Mountings to Facili- 

 tate Sweeping in Right As- 

 cension, 270. 



Members, Foreign Honorary. See 

 Foreign Honorary Members. 



Meteoric Constitution of the Uni- 

 verse, 370. 



Milk, Constitution of, 371. 



Molecules, Mean Free Path of, 374. 



Motion and the Calculus, 372. 



Motion, Periodic, Simple Appara- 

 tus for Illustrating, 232. 



N. 



Nebulae, Work now in Progress at 

 Harvard College Observatory 

 upon, 370. 

 Newberrya congesta, 44. 

 spicata, 44. 



O. 



Officers elected, 368, 389. 

 Orthobrombenzyl Compounds, 213. 



alcohol, 213. 



cyauide, l'14. 



sulphocyanate, 215. 



amines, 215. 

 Orthocarpus Bidwellia;, 51. 



Pendulum, Foucault's Method of 

 Obtaining a Permanent Rec- 

 ord from, 376. 

 Pentstemon Rattani, 50. 

 Perezia Coulteri, 40. 

 oxylepis, 41. 

 Parry i, 40. 

 Perforated Vibrating Discs, 222. 

 Perymenium parvifolium, 36. 



tenellum, 36. 

 Phacelia (Microgenetes) Cooperse, 



49. 

 Philactis longipes, 35. 

 Photometric Researches, 236. 

 Lime light, 238. 

 Gaslight, 241. 

 Standard candle, 242. 

 Magnesium light, 242. 

 Moonlight, 244. 

 Sunlight, 246. 

 Physics, Cosmical, Propositions in, 



201. 

 Piqueria serrata, 25. 

 Plates, Circular and Elliptical, Vi- 

 brations of, 219. 

 Plethysmograph, a New Form of, 



22. 

 Proceedings, 367. 



R. 



Ranunculus Macauleyi, 45. 



Relation of Architect to Under- 

 writer, 374. 



Rhododendron (Azalea) Vaseyi, 48. 



Rumford Committee Appropria- 

 tions, 307, 369, 370. 



Rumford Medal, 375. 



Satellites of Mars, Movements of, 

 372. 



Spectrum of Solar Protuberances, 

 Temporary Change of Re- 

 frangibility in, 370. 



Stellar spectra, 375. 



Stevia stenophylla, 25. 



Suksdorfia violacea, 42. 



Tagetes Parryi, 40. 

 Taylor's Theorem, 'i7l. 



