1890.] 



Presents. 



189 



et la distance des aretes serait, a 62° F., en arrondissant le chiffre des 

 microns : 



1-001801 m. 



G. Defforges. 



[Note. — Since the above was in type I nave been favonred by 

 Mr. 0. H. Tittmann with a copy of the U. S. Coast and Geodetic 

 Survey's ' Bulletin,' No. 9, dated 15th June, 1889, on the relation of 

 the yard to the metre, in which it is shown that the value 

 1 metre = 39-36980 inches is somewhat more probable than the 

 value above adopted from Col. Clarke. This value makes the 

 distance between divisions and 39'4 of the Shuckburgh scale = 

 39-399796 inches, showing an error of — -0002 instead of +'0004 

 inches, as above indicated.— March 24, 1890.— J. T. W.] 



III. "Note on the Spectrum of the Nebula of Orion." By J. 

 Norman Lockyer, F.R.S. Received February 13, 1890. 



[Publication deferred.] 



IV. " Preliminary Note on Photographs of the Spectrum of the 

 Nebula in Orion." By J. Norman Lockyer, F.R.S. Re- 

 ceived February 13, 1890. 



[Publication deferred.] 



Presents, February 13, 1890. 



Transactions. 



Frankfort-on-Oder : — Naturwissenschaftlicher Verein. Monatliche 

 Mittheilungen aus dem Gesammtgebiete der Naturwissen- 

 schaften. Jahrg. VI. Nr. 12. Jahrg. VII. Nr. 1-2. 8vo. 

 Frankfurt a. O. 1888-89. The Verein. 



Kew : — Royal Gardens. Bulletin of Miscellaneous Inf ormatiorj . 

 No. 38. 8vo. London 1890. The Director. 



London : — Middlesex Hospital. Reports of the Medical, Surgical, 

 and Pathological Registrars. 1888. 8vo. London 1889. 



The Hospital. 



Odontological Society of Great Britain. Transactions. Vol. 

 XXII. No. 3. 8vo. London 1890; List of Members, 1890, 

 8vo. The Society. 



