48 PROCEEDINGS OF THE ACADEMY OF [1887. 



After extracting with acid, whereby A gave 73 asbestos, 27 

 calcite, and material B gave 85 asbestos, 15 calcite, the residue 

 was thoroughly dried at 130C., and then analyzed as follows: 



100-40 101-00 



The molecular ratio is formed for 



SiO' : (Mg, Ca, Fe, Zn, Mn H^) O 

 A. 1-8613 1-9716 



1-00 1-06 



(Mg, Ca, Fe, Zn, Mn W) SiO 

 SiO' : (APFe)' : Mg, Ca, Zn Fe H^ O 

 B. 1-7833 : 0-1279 : 1-6911 



Or, if Ave add the sesquioxides to the protoxides 



1-7833 



= 1-00 : 1-016 



1-8190 

 We have here then two Bisilicates, remarkable for the poly- 

 basic composition, which are either pyroxene or amphibole 

 asbestiform. I am inclined to classify them as amphibolic. It 

 is probable that these silicates are in a number of collections 

 under the name of Sussexite, with which notably the material A 

 shows much resemblance. 



