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T A I! I, K I. 



By .suhti'iicling llii.s reshiiit, wliich has to he regarded as a constant 

 part, from the eorres|»onding \alnes, tlie dillerences exhibited in the 

 last ('ohinnis have been tumid, which are to be regarded as fortnitous 

 distni'liances. < 



4. The valne to be atlaclied to tlie i-esnlt may be estimated in 

 different ways. 



The tirst and most simple manner is to split np the series into 

 two or more gronps. From the data given in Table I we easily find : 



