112 ABSOLUTE ATOMIC WEIGHT. 



In their third series the work is 200 times as excellent 

 and reliable, according to the Smithsonian mode of calcula- 

 tion, than in their second series. 



In their fourth series they have risen to the exalted stand- 

 ard four thousand times the capacity of Dumas in 1860, when 

 he was considered the greatest chemist of the world. 



And how rapidly our young chemists of Old Harvard 

 develop, how astonishing the rate of their progress, how 

 tremendous the swiftness wherewith they do " evolute!" 



Starting ({ only 20 times as perfect as Dumas," they are 

 ten times surpassing themselves in the work of the third 

 series, and two hundred times when closing the fourth series. 



And all this progress and evoluting done in the space of 

 a few months! 



Not a word is inaccurate in the above, not a figure or 

 proposition that is not obtained strictly according' to the 

 fundamental formulae^ pp. J and 8 of the tl Constants of 

 Nature," produced by Frank Wigglesworth Clarke, Chief 

 Chemist of the Geological Survey, in the employ of the 

 Secretary of the Interior of the United States of America, 

 and published with the endorsement of the Secretary of the 

 Smithsonian Institution at the cost of the fund which the 

 Englishman Smithson gave to the United States Congress 

 for the foundation of an it Institution for the Increase and 

 Diffusion of Knowledge among' Men per orbem 



Richards Really Progressed 0.01 Only. 



The measure of precision has been considered seriously 

 as it must be, since we follow the directions and formula of 

 a Government Publication. 



Now let us see how the final results look when examined 

 as to its absolute value according to our standard. 



This, our standard, has now been tested by the atomic 

 weights of lead, iron, mercury, sulphur, chlorine, carbon 

 and calcium, that is, by the great chemical elements, great 

 in every sense of the word. 



These atomic weights' are based upon the work done by 

 Berzelius, Svanberg (in the laboratory of Berzelius), Erd- 



