



1^. 



substituting^ ^iSiffijCl ibfiJisalub iSlKi, S being the suifoce d^^X^i 



iiih^the dbov^t&iiibual^fAkitbtfabfirit of the two equations e:^-^^ 

 pressing the value of Cg, we have used for brevity the lettej^'ft ; 

 /cy A% and K, for the following expressions iTrr... .,j.. i^.^^uaip 



uifi:> 



level of the sea is equal to the mean depth of the ocean, ana 

 for the value of the latter two miles, the surface of the sea 

 twice that of the dry land, and the density of the water half 

 that of the land, the value of C^ will evidently be two milesJ' 

 A value of V not very inconsistent with observation woula ^ 

 be half a mile ; those of « and /3 are obtained from Mr^'^ 

 Airy's treatise on the Figure of the Earth. We have made 



of a- Seconil,' as it has feeen 'shoM^fl^tllkif th^ length" 



. 1000 ,., . , -yf,, 



of; the day had varied since>, the time of Hipparchus by tl^^ 

 one-three-thousandth part of a second, the value of the secula^; 

 equation of the moon would be changed by more than ^l*^. 



The sidereal day being repreSferitRfti^^H^ ilf^fcAfbl^^ 



.ju. ».(.;.,;- ^. ;.»,.,./;,..■ .;,f?,v. .|^uw:, Huki lu jioujiunoi vii'l .aim 



86400000 :q 



will be less than five feet multiplied into the area of all tJaol 

 dry land. ".^^'^ 1 ^ii'* ':ip^^9^ ibyinqasci ^i/ Jon {f?^' 



The amount of dei^datibttof tHe J««tijU stir^lttce' repre- 

 sented by the above quantity appears to be within the limits 

 which can be assigned by geological observations. »* 



Dublin, July 9, 1845. 



LX. On a Peculiar Method of obtaining the Sesqui-Jerrd^ 

 cyanide of Potassium. By Prof Schgsnbein, of Basle*. = 



MY experiments on ozone have shown that this substance, 

 like chlorine, is capable of transforming the yellow 

 ferrocyanide of potassium into the red one. The other daf 



* Communicated by the Author. 



