28 1 Register of the Weather in Plymouth. [April, 



with the accession of 0-2 of uran oxide, that was mixed with the 

 copper in the ammoniacal solution, will constitute the whole 

 amount of uian oxide ^A-AS. The 7'65 grs. of copper must be 

 increased by 0-62 = 8-27. 



After the last separation of copper, I could not by any methods 

 discover any substance in the residuum but oxide of uranium. The 

 relative amount of the several ingredients of uran mica stated, at 

 one place of decimals, will be as follows : — 



Oxide of uranium, with a trace of oxide of lead . . 74*4 



Oxide of copper 8'2 



Water 15-4 



Loss 2 



100 



This statement agrees so very nearly with the result of a former 

 analysis of the same quantity of uran mica, that 1 do not think it 

 necessary to set down the average mean of the two operations. 



The copper exists in this fossil in a much larger proportion than 

 it was conceived to be. 



I should not, probably, lay much stress upon the minute quantity 

 of oxide of lead which I found in this fossil, if I had not recol- 

 lected that 1 had some years ago detected the same oxide as more 

 decidedly constituting an ingredient of ihe ye lloiv uran mica. 



The ease with which this fossil parts with its water in a low red 

 heat is a circumstance that will probably prevent its being denomi- 

 nated a hydrate of uranium and copper. 



Creed, Feb. 21, 1815. W. GrEGOK. 



Article VI. 



Register of the Weather in Plymouth for the last Six Months of 

 1814. By James Fox, jun^ Esq. With a Tlate. 



JULY. 



