Fig. 306. 



PLATE XLYIII. 



30 . 



d crystal of sulphate of copper, crystallize' ; 



. 303. 



The same at 90 to 100. 



"Spiral" cr- ite of copper, crystalled at different temperatures, p. 215 After Mr Thomas of Oxford 



From the Mio. Journal, July. 1866. 



[To face page 216. 



