518 Dr. Barker on the relative value of the 



with the other quantities, very small, and may be neglected. The 

 vis viva of the motion of revolution round the sun, if jj be the mass 

 of a planet, and p its distance from the sun, is 



j^_ yr^M/x /I 1 \ 

 m I R 2p J ■ 



Omitting the quantity — as very small compared with —-, and di- 

 2p K 



viding by the above value of V, we obtain 



L_5 ^ 

 V~3 M' 



The mass of all the planets together is ——of the mass of the sun, 



738 



hence the value of L for the entire system is -i. 



L=-L.V. 

 453 



LXV. Remarks on the relative value of the Ozonometei's of 

 Drs.' Sclionbein and Moffat, based upon daily observations for 

 eighteen months at Bedford. By T. Herbert Barker, M.D.^ 



THE discovery, in 1840, by Dr. Schonbein, of that principle 

 in the atmosphere to which he gave the name ozone, has 

 excited considerable interest throughout Europe. The indi- 

 cations already noticed of a probable connexion between this 

 newly-observed agent and certain states of the atmosphere affect- 

 ing the public health, especially the remarkable disappearance of 

 all signs of its existence during the epidemic prevailing in the 

 summer of 1854, together with several less striking, yet important 

 coincidences already recorded by ozone observers, might tempt 

 the speculative mind to indulge in premature theorizing. But 

 it must be remembered, that, while we have already ample mate- 

 rials for speculation, we have, comparatively speaking, but a 

 scanty supply of those well-ascertained facts of coincidence on 

 which a sound theory must be based. To gain a true insight 

 into the nature and the effects of ozone, we must first add 

 greatly to the number of our observations. 



Taking this view of the stage at which we have already arrived 

 in tbe investigation of ozone, it becomes highly important and 

 interesting to inquire by what means iis presence in the atmo- 

 sphere may be most surely and readily detected. It is obvious, 



* Communicated by the Author. 



