THE DARTMOOR VOLCANO. 
169 
The Lundy granite is probably of the same age as the Dartmoor, 
and Professor Prestwich 2 has shown that ten miles of rock which 
formerly connected that island with the main must have been 
worn away previous to Pleistocene times. I do not take this as 
indicating the rate of Dartmoor denudation, for marine waste is 
one thing, and subserial is another; but it enters into our calcu- 
lation thus far : it shows that prior to the inauguration of the 
existing relations of sea and land Dartmoor must have been 
exposed to denuding influences for a period long enough to enable 
the sea to do this work. 
The volcano of Mull dates only from early Tertiary times — the 
Eocene; but it has been reduced from 14,500 feet to 3172. The 
volcano of Dartmoor has probably been reduced from 18,000 feet 
to 2000 ; but the additional work bears no calculable relation to 
the additional time given by its higher antiquity. 
COMPETITION AND CO-OPEEATION". 
SYLLABUS OF LECTURE BY J. C. INGLIS, C.E. 
(Read 25th October, 1888.) 
Definition and importance of the two terms competition and 
co-operation. "Wealth in the economic sense defined. Wealth 
involves exchange, and exchange in civilised communities in- 
volves money. Exchange essentially involves service for service, 
and it is put in operation by the idea of advantage which each of 
the exchanging parties entertain. Competition is the stake pro- 
duced by several offering and several demanding service or goods. 
Competition is the free play of all the self interests of which it is 
the outcome. The relations of buyers and sellers. The relations 
of buyers with buyers and sellers with sellers. Difference between 
competition and selfishness. Competition is always welcome be- 
tween buyer and seller, but not between buyer and buyer and seller 
and seller. Self interest is the great factor in binding society 
together, but although it is not the most esteemed impulse of 
human action that does not prove it is not a very powerful force 
in social economy. The attitude of Trade Unions to competition. 
Exchange in labour and commodity operate under the same laws. 
2 Geology, i. 100. 
