ASTRONOMY. 205 



Meteors — Continued. 



Denning (W. F.) Hoiftlits of iiro-l)all.s and shooting stars. Month. Not., 48 : 112. 

 Kleujer (J.) Verthoiliin.ic dcr Meteoro iu Meteorschwiirnien. Astron. Nachr., 



118: 345. 

 Meunier (S.) Rapports mutuels dos in^tdoritos et dos 6toiles filantca. Compt. 



Rend., 107: 834. 

 VK TiLLO (A.) Rechorchos snr la repartition des points radiants d^'lpr^s Ics inois 



de ranu6e et d'apros les coordonn6es cdlcstes. Bull. Astron., 5 : 237-248, 283-'Jl. 

 Meteors (Observations of). See, also, Meteors. 



Denning (W. F.) Height of a Perseid lire-ball. il. Month. Not., 4'J: 19-21. 



Height of a Leonid fire-ball. il. Month. Not., 49 : 06. 



Leonid meteor-shower, 1888. Nature, 39 : 84. 



Micrometers. 



CoMSTOCK (G. C.) Value of one revolution of a micrometer screw. Sid. Mess., 



7 : 343-409. 

 Kempf (P.) Uober Lamellon-mikromoter. Astron. Nachr., 119:33-38. 

 OUDEMANS (J. A. C.) Condition that in a double-image micrometer the value 



of a revolution of the micrometer screw may be independent of the acconmio- 



datiou of tlio eye. Mouth. Not., 48 : 334. 

 TUPMAN (G. L.) Ou the cross reticule, il. Month. Not., 48 : 96-103. 



Description of a cross-bar micrometer. Obsry., 11 : 58-61. 



Mirrors. 



Common (A. A.) Testing polished flat surfaces. Month. Not., 48: 105. 

 Madsen (H. F.) Notes on the process of polishing and liguring 18-iuch glass 



specula by hand, and experiments with flat surfaces. Jour, and Proc. Roy. 



Soc. N. S. Wales, 20 : 79-91, 188G. 



Rev. by Common (A. A). Nature, 37 : 382. 

 Mitchel (Ornisby Mcknight) [1809-'G2"|. 



MiTCiiEL (F. A.) Ormsby Macluiight Mitchel, astronomer and general: a bio- 

 graphical narrative. 8 + 392 1). portr. 12mo. Boston, 1887. 



Moon. See, also. Lunar THEORy. 



Elger (T. G.) Sir William Herschel's observations of volcanoes in the moon. 



Obsry., 11 : 377. 

 Grensted (F. F.) Theory to account for the airless and waterless condition of 



the moon . . . Svo. Livcrjiool, isrfs'. 

 HOLDEN (E. S.) Sir William Herschel's observations of volcanoes in the moon. 



Obsry., 11:334. 

 Hunt (G.) Sir William Herschel's observations of volcanoes in tho moon. 



Obsry., 11:403. 

 Thureix( — ) ElementarcDarstoUungderMondbahn. 4to. Berlin, 1888. .(M. 1) 

 Williams (A. S.) SirWilliam Herschel's observations of volcanoes iu tho moon. 



Obsry., 11: 378. 

 WoLE (M.) Aufnahme von Mondphotographien. il. Sirius, 21 : 97-100. 

 Moscovy Observatory. 



Annalus de I'observatorie de Moscou . . . 2 s., v. I. 2. livr.iison. 128 p. 6 pi. 



4to. Moscow, 1888 (M, 6) 



Nadir. 



PiSRIGAUD (E.-L.-A.) Nouveau bain do mercuro pour I'observation du nadir. 



Compt. Rend., 106:919-921. 

 Observations d'dtoiles par r6flexion et la nu\sine do la flexion du cercle do 



Gambey. Compt. Rend., 107:613. 



Natal Observatory. 



Report of tho superintoiulent . . . 1887. 26 p. 4to. [n. p., n. d.] 



