Pottox—A New Thermo-Chemical Notation. 505 
Ist. é| HI - KHO - KI + H.0] = @ = IK 
- gH - éEKHO a éKI + €H.0 
éHI =- éKHO + éKI + €H.0 
le 
Oe 
2nd. &[ KI + Cl =KkCl +T] = == IO 
EKI = - €Cl + EKCl + EI = (, 
3rd. €/KHO + HCl =O 4 sO] = @ = Isr7, 
EKO] = + EKHO + EHC! - €H.0 + «. 
Substituting this value for KCl in the second equation and the 
value thus obtained for EKI in the first equation, we get 
EHI = -EKHO- ECl+c + EKHO + €HCl - 5H.0 
[o) 
# Ell =O GEL ON a 
= § HCl -§0l-a-b+e 
= 39°3 —-15 -191 - 1924137 
= 13°2K°. 
In this last example a free use has been made of all the 
ordinary processes of algebra, and the result obtained by the 
proper statement of the correlation of the various quantities, and 
the subsequent development of the unknown quantity in terms 
of the known quantities. It is at least doubtful if such an 
example could be worked out by any of the notations previously 
in use, and it shows the benefit of giving a clear expression to 
the whole material system under consideration together with 
the energy evolved or absorbed in its various transformations. 
In conclusion, I have to thank Professor Hartley for his kind 
revision of this Paper, and for suggesting some of the illustra- 
tions of the use of the notation. 
