28G 



On a New Class of Org ano -metallic Bodies, [Feb. 11, 



And in a similar way I calculated the dips for all the stations, taking 

 Utrecht first, because the dip found for Munich from this station gave a 

 result differing from the mean the most of any ; and then I treated Brussels 

 in the same way, it being the next in order of discordance, and so on. 



I thus formed Table III., giving the calculated dips, the observed dips 

 with the local instruments and the Kew Circle, and the corrections for the 

 Kew Circle. 



Table III. 



Stations. 



Calculated 

 Dips. 



Dips observed 



with local 

 instruments. 



Dips observed 

 with Circle 

 from Kew. 



Calcul.-Obs. 



with 

 Kew Circle. 





68 1-69 



68 2-19 



68 3-80 



-2-11 



Greenwich ... 



67 56-84 



67 56-15 



67 58-88 



-204 





68 15-50 



67 17-86 



68 17-86 



-2-36 



Brussels ...... 



67 4-12 



67 11-00 



67 6-77 



-2-65 



Utrecht 



67 41-37 



67 47-70 



67 43-30 



-1-93 



Yienna 



63 36-73 



63 32-06 



63 38-80 



-2-07 



Munich 



64 6-70 





64 7-70 



-1-00 





65 47-80 



65 45-30 



65 49-85 



-2-05 









Mean 



-2-03 



This Table shows that the Circle from Kew gave at all stations the dip 

 about 2' too large ; and only for Munich this difference is but 1', which 

 shows that the calculated dip for Munich is a little too large. 



III. " On a New Class of Organo-metallic Bodies containing So- 

 dium." By J. Alfred Wanklyn, Professor of Chemistry in 

 the London Institution. Communicated by Professor E. W. 

 Brayley. Received February 6, 1869. 



Up to the present time organo-metallic bodies containing ethylene in union 

 with the metal have been often sought, but never recognized. 



I have to announce the existence of organo-metallic compounds of ethy- 

 lene with the alkali-metals. In ethylate of sodium, or at any rate in the 

 substance which is produced by heating up to 200° C. the well-known 

 crystals got by acting on alcohol with sodium, I see the hydrated oxide of 

 ethylene-sodium — 



iNa | 0H , 



which, as I have recently shown, yields alcohol and a new compound on 

 being heated with the ethers of the fatty acids : thus 



Hydrate of ethylene- 

 sodium. ' Acetate of ethyl. Acetate of ethylene-sodium. 



N »"'{Sk H ' + Si to} - Na "'{obfH 3 + C,H.O. 



