482 



MR J. Y. BUCHANAN, F.R.S., ON THE 



CO s would be driven off, also all the water, and two-thirds of the available oxygen. We 



have then — 



Moisture removed at 162°, . . T47 per cent. 



C0 2) 8-87 



3/7 available oxygen, . . . 1-76 „ 



Balance, . . . 5 64 „ 



Total loss found, 



17-74 



We have then the following composition 



Moisture, 







147 per cent 



Carbonic acid, 







8-89 



Available oxygen, 







4T0 



MnO, . 







32-43 



Co 2 3 , . 







0-025 „ 



CuO, 







traces 



Fe 2 3 > . 







2 31 per cent. 



A1 2 3 . 







114 „ 



CaO, . 







6-83 



MgO, . 







4-08 „ 



K 2 0, . 







0-47 



Na 2 0, . 







043 



PA, . 







057 



Soluble Si0 2 , . 







6-32 



Balance of insoluble residue, 





27-73 



Do., loss on ignition, 







5-64 



102-43 



If we assign the C0 2 first to the CaO and then to the MgO, we shall have — 



CaC0 3 , 

 MgCC-3 

 MgO, 



12'20 per cent. 

 5-17 

 241 



Analysis of the Mud in which the Nodules from Loch Fyne were found. 



The mud was air-dried, and had been freed from manganese nodules and shells. The' 

 moisture, carbonic acid, available oxygen, manganous oxide, and insoluble residue were 

 determined, with the following results : — 



Moisture at 162° C, 

 Carbonic acid, 

 Available oxygen, 

 MnO, . 

 Insoluble residue, 

 CuO, . 



5*92 per cent. 

 2-55 



merest trace. 

 0"71 per cent. 

 74-26 

 distinct traces. 



