162 



Mr. Prideaux on the mean Atomic Weights 



tive methods shall be known, that a regulated mean would 

 be a nearer approximation than either? 



The following Table for correcting the scale, mentioned in 

 my last communication*, is constructed upon this principle. 

 The experiments which led me to it being comparatively few, 

 it would not have been offered to your pages but for the 

 obvious reasons above quoted. For such a purpose three or 

 four places of decimals would have been inadmissible; nor 

 does any one employ a scale of equivalents for delicate pro- 

 portions, unless as a banker uses an interest-table to check 

 his calculations. 



Table of Atomic Weights of Simple Bodies, according to Thom- 

 son and Berzelius ; with a mean weight deduced. 



Thom- 

 son. 



Aluminum 

 Antimony .. 

 Arsenic . . 



Azote.... 



Barium...., 

 Bismuth. . . 

 Boron 



Bromine .. 



Cadmium . 

 Calcium .... 



Carbon 



Cerium .... 



Chlorine .. 



Chromium 



Cobalt 



Columbinm 

 Copper , 



Fluorine..., 



Fluoron 

 Glucinum.. 

 Gold 



Hydrogen . 

 Iodine ... \ 



Iridium t 



Berzelius. Mean 



1-25 



5-5 



4-75 



1-75 



8-75 



9- 



1- 



10-f 



7- 

 2-5 

 0-75 

 6-25 



4-5 



3-5 

 3-25 



18- 

 4- 



2-25 



0-25 



2-25 

 25- 



0-125 



15-5 

 •16+ 



3-75 



171-167 

 806-452 

 470-042 



177-036 



2 



856-88 



1330-376 



135-983 



978-3 

 2 



696-767 



256-019 



76-437 



574-718 



442-65 



351-819 

 368-991 

 1153-715 

 395-695 



233-8 



331-479 

 1243-013 



12-4796 



2 

 1578-29 



2 

 1233-26 



1-2 (a) 

 5-5 (5) 

 4-73 



1-76 



8-66 

 9- (c) 

 0-95 (d) 



9-9 



7- 



2-53 

 0-76 

 6- 



4-46 (e) 



3-51 



3-4 (/) 

 18- (g) 

 3-98 



2-3 



0-3 (k) 



2-22 (i) 

 25- 



0-125 



15-8 

 12-42 



Iron , 



Lead 



Lithium. . .. 

 Magnesium 

 Manganese 

 Mercury .. 

 Molybden"' 



Nickel 



Osmium J... 

 Oxygen 

 Palladium J 

 Phosphorus 

 Platinum;};.. 

 Potassium ., 

 Rhodium .., 

 Selenium ... 



Silicon 



Silver 



Sodium 



Strontium. 

 Sulphur...., 

 Tellurium . 

 Thorinum . 



Tin 



Titanium .. 

 Tungsten .. 

 Uranium .. 

 Yttrium.... 



Zinc 



Zirconium . 



Thom- 

 son. 



Berzelius. 



3-5 

 13- 



1-25 



1-5 



3-5 

 25- 



6- 



3-25 



1- 



7- 



1-5 

 12- 



5- 



5-5 



5- 



1- 

 13-75 



3- 



5-5 



2- 



4- 



II 



7-25 



4- 



15-75 

 26- 



4-25 



4-25 



5- 



339-213 

 1294-498 



127-757 

 158-353 

 355-785 



1265-82 

 598-525 

 369-675 



1244-21 

 100-00 

 665-84 

 196-155 



1233-26 

 489-916 

 651-4 

 494-582 

 277-478 



1351-6 

 290-897 

 547-285 

 201-165 

 806-452 

 744-9 

 735-294 

 389-092 



1183-2 



2711-36 

 401-840 

 403-226 

 420-238 



Mean. 



3-45 

 13- 



1-26 



1-55 



3-53 

 12-55 (/c) 



6- 



3-4 (0 

 12-53 



1- 



6-7 



1-96(ot) 

 12-42 



4-95 



6-56 (») 



4-98 



1- (o) 

 13-63 



2-96 



5-49 



2- 



4- 



7-45 (p) 



7-3 



3-95 



26-5 

 4-14 0) 

 4-2 00 

 4-6 (r) 



* See Phil. Mag. and Annals, N.S. vol. vii. p. 276. 

 f Not given by Thomson, but calculated from Berzelius's last experi- 

 ments by Thomson's number for Chlorine. 



I See the note on Rhodium. || Quarterly Journal, April 1830. 



{a.) Alumi- 



