278 [Nov. 27, 



III. "On the Tides of the Arctic Seas. Part II. The Semi- 

 diurnal Tides of Port Leopold, North Somerset." By the 

 Rev. SAMUEL HAUGHTON, M.A., F.R.S., Fellow of Trinity 

 College, Dublin. Received October 8, 1862. 



(Abstract.) 



The first part of the author's researches on the Tides of the Arctic 

 Seas was forwarded to the Royal Society in November 1861, and 

 contained the discussion of the Diurnal Tides of Port Leopold. In 

 the present communication the Semidiurnal Tides of the same port 

 are discussed, and the following results obtained. The eccentricity 

 of the moon's orbit is calculated from the parallactic inequality, and 

 found to be 0*5303. 



The solitidal interval is 56 m . 



The lunitidal interval 4 h 54 m . 



The ratio of the solar to the lunar coefficient is found to be 0*3956. 



The mass of the moon ^th. 



And the depth of the Atlantic is calculated from received tidal 

 theories. The most probable results are found to be, 



From semidiurnal tidal intervals . . 3*529 miles. 

 From diurnal coefficients .... 3*690 



There are other values of the depth of the sea, much greater than 

 these, which follow from other considerations of the tidal theory ; 

 and the author is unable to explain why theory should give results 

 so different. The preceding, however, he believes to be most in 

 accordance with facts. 



IV. "On the Action of Chloride of Iodine on Iodide of Ethylene 



and Propylene Gas." Second Notice. By MAXWELL 

 SIMPSON, M.B., F.R.S. Received October 23, 1862. 

 In my last communication to the Society* I announced that a 

 body having the composition expressed by the formula C 4 H 4 1 Cl 

 was formed when iodide of ethylene was subjected to the action of 

 chloride of iodine. I have since ascertained that the same body may 

 be obtained by the direct action of ethylene gas on the latter reagent. 

 By this process it can be prepared in large quantity with great facility. 

 * Proceedings, vol. xi. p. 590. 



