This organ enables us to form the idea of number, or the plurality of
objects. It assists in the recollection of dates and quantities. It
enables one to readily understand numbers and their combinations. Its
activity takes place, whenever there is a departure from unity. A
large endowment of this organ is not essential to the algebraist and
geometrician, its functions being limited to arithmetical calculations.
Predominant.--One having Calculation predominant, will reckon in his
head almost any arithmetical problem that can be proposed to him.
If Causality and Comparison are large, he will excel in the higher
branches of mathematics, and possess a great fondness for these studies.
Large.--With calculation large, one will be distinguished among his
acquaintances for his skill in arithmetical calculations. He will be
enabled to tell at a glance, operations which to an ordinary accountant
require the use of figures. If Causality and Comparison are large, he
will excel in solving difficult problems in the higher mathematics,
but if these organs are deficient, his talent will be limited to
arithmetical calculations.
Moderate.--With Calculation moderate, and in a situation which
constantly demands the act of ready calculation, one may become highly
talented in this respect. He will, however, require time and effort
to go through an intricate operation. If Causality and Comparison are
large, in ordinary circumstances he will accustom himself to the use of
a slate and pencil for all operations of a complicated character.
Small.--With Calculation small, one can succeed in arithmetical
calculations only by dint of great labour, and then only to a limited
extent. If Causality and Comparison are large, he may be capable of
the higher branches of mathematics, but the difficulty, which his
arithmetical calculations cost him, will render him averse to all
mathematical speculations.