7. CALCULATION.
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.