deposits; the study of this question will likewise constitute the 
chief concern of the future “International Institute for Mining 
Economics”, It will have to be discussed at the International 
Congress that is to taken place at Pretoria, South Africa, in 1929. 
Negotiations are being carried on between German and inter- 
national authorities with a view to securing for mining economics 
the importance it should possess in schools, in the administration, 
with the different economic alliances and international congresses, 
and to furthering their development on the lines indicated above. 
B, Scientifig Questions 
We believe we ought, besides these practical ends, to establish 
as soon as possible certain leading principles for our future 
endeavours, without which a division of labour in view of a metho- 
dical synthesis of the results obtained would be frustrated. In 
order, therefore, to facilitate the future endeavours of the Associa- 
lion, and to secure, at the same time, a starting point of practical 
efficieny, our efforts should, in our opinion, be concentrated first 
of all upon the problems of the estimate and economical evaluation 
of such deposits as have as yet remained unexploited. This problem 
is known by the name of “Inventory of deposits”. 
The evaluation of the reserves of iron ore and coal, phosphate 
and pyrites furnished by the Geological Congresses of Stockholm 
1910, Toronto 1913 and Madrid 1926, and the evaluations of gold 
reserves to be furnished by the future Congress of Pretoria may 
be considered as but imperfect tentatives in the feld of geology. 
Such attempts, however, at international co-operation, should 
be made use of for the purpose of establishing and developing a