THALLIUM. CROOKES. 125 



Thejift/t decimal is twice 3, thrice 2 } twice i and twice o. 

 The aggregate is 14, mean of nine 1.5. 



Hence, the mean analytical ratio of all 10 determinations 

 except the very first, excluded by us for good reasons, is 

 1.30 3915, which is only half a unit in the fifth place below 

 our atomic ratio calculated from our atomic weights. 



This mean analytical ratio must be considered absolutely 

 identical tvith our atomic ratio. 



As the range is also, for these 9 determinations, only 3, 

 and as these slight differences are well distributed, we are 

 indeed face to face with something remarkably excellent in 

 apparent accuracy. 



Since now a rise of o.i in the atomic weight 204 of 

 thallium produces a lowering of the analytical ratio of 15 

 units in the fifth place, the half a unit actually low repre- 

 sents a rise of only one thirtieth of such a tenth, that is one 

 three-hundredth of a unit, or only 0.003. 



Taking the excess of this analytical ratio as we find it, 

 the atomic weight of thallium corresponding thereto would 

 be 204.003. 



We can therefore state, that the 9 determinations of Mr. 

 Crookes of 1873, demonstrate the true atomic weight of 

 thallium to be 204 exactly, and that the possible deviation is 

 not more than three thousandths of a unit. 



Now this is most satisfactory to me. Mr. Crookes has 

 done a great work for "my theory" which he has abused, 

 and for our work in general, which Sir William Crookes has 

 editorially denounced like a barbarian and a brute. 



Crookes Annihilates Sias. 



But Mr. Crookes has done much more than this. He 

 has furnished us experimental determinations of the highest 

 order ; absolutely and totally annihilating the entire System of 

 the Stasian Atomic Weights. 



Now, Sir William Crookes, in that notorious editorial 

 against me, declares himself once again for this system of 

 Stas; coarsely expresses his apparent hatred of me, because 

 I have dared to show this Stasian System of Atomic Weights 

 to be wrong, and here he himself proves I was right! 



