Mr. Halliwell on Tornorley's Attack tipon Vieta. 313 



neutml Scheelate of protoxides of iron and manjranese. 

 (2.) That more scheelic acid would be contained in the mi- 

 neral that theory assumes, whence an excess of from 4'5 to 

 6-6 per cent, arises. (3.) That the proportion of Fe to Mn, 

 though different in specimens of wolfram from different lo- 

 calities, IS always in the ratio of low multiples of their che- 

 mical equivalents. 



Wolfram from Monte Video and Ehrenfriedersdorf. 

 4 Fe W+ Mn W. Specific gravity = 7-544. 



Monte ViJeo Ehrenfriedersdorf 



analysis. analysis. Formula. 



Fe 19-24 19-16 19-26 



Mn 4-97 4-74 4-89 



W 75-89 76-10 75-85 



Wolfi-am from Chanteloupe. 3 Fe W + Mn W. 

 Specific gravity = 7-437. 

 Analysis. Analysis, Analysis. Formula. 



Fe 17-81 18-33 17-71 18-06 



Mn 6-20 5-67 6-29 6-11 



W 75-99 76-00 76-00 75-83 



Wolfram from Zinnwald. 3 Mn W + 2 Fe W. 

 Specific gravity = 7-191. 



Analysis. Analysis. Analysis. Analysis. Analysis. Formula. 

 Fe ... 9-55 9-49 9-50 ... "1 24-13 ^'^^ 



Mn... 15-12 14-85 ... 14-57J 14-64 



W ... 75-33 75-66 ... ... 75-87 75-74. 



XLVIII. New particulars relating to Nathaniel Torpoiley' s at- 

 tack tipon Vieta, the celebrated Aiialyst. By J. O. Halli- 

 well, Esq., F.R.S., Hon. M.R.I.A., 4-c. 



A NTONY WOOD tells a story of Torporley having 

 -^*- been amanuensis to Vieta, and then quarrelled with him, 

 writing a book against Vieta under the assumed name of 

 Poullerey, wliich he says is " Torporley transposed." The 

 late Professor Rigaud attempted unsuccessfully to discover 

 the origin of this relation, and to examine its correctness. In 

 a letter to nie dated March 14th, 183.S, he thus writes; — " I 

 have never been able to meet with this book [viz. the one 

 whicli Torporley wrote against Vieta], and 1 remember ha- 



Pfiil. Mag. S. 3. Vol. 20. No. 131 . April 1842. Y 



