On the Uniformity exhibited in Tables of Statistics. 359 

 Lead and Antimony. 



These researches reveal two important facts : first, that there 

 is one metal the alloys of which always contract, viz. those of 

 copper, whilst all the amalgams expand or have a less specific 

 gravity ; secondly, that the maximum expansion or contraction 

 of alloys and amalgams generally occurs in those which are com- 

 posed of one equivalent of each metal, the exception being those 

 of tin and zinc. But this arises no doubt from the fact that 

 all the alloys, with the exception of the latter, are compounds 

 and not mixtures. 



We must, in conclusion, draw attention to the extraordinaiy 

 contraction or expansion that some of these alloys experience. 

 Thus, for example, the alloy of 3 of copper and 1 of tin, — 

 Found. Calculated. Difference. 



8-954 8-.208 0-746 



whilst the amalgams of tin expand to nearly the same extent, as 

 shown by these results : — 



\ of Mercury! }'°^'^^- ^''}?^^i^^- Difference. 



1 of Tin /)lO-3o5 11-259 



1-004 



LVI. On a Test for ascertaining whether an observed degree of 

 Uniformity, or the reverse, in Tables of Statistics is to be looked 

 upon as remarkable. Bij Robert Campbell, M.A., Advocate, 

 Edinb., Fellow of Trinity Hall, Cambridge*. 



THE following problem M^as suggested by certain i-emarks in 

 Mr. Buckle's introductoi-y chapter to his ' History of Civi- 

 lization.' In that chapter Mr. Buckle remarks upon the striking 

 * Communicated by the Author, an abstract having been read in Section 

 A at the Meeting of the British Association at Aberdeen, Sept. 20, 1859. 



