We will now give names to the cubes of Block 1 of the 81 Set. We call each one Mala, to denote that it is a cube. They are written in the following list in floors or layers, and are supposed to run backwards or away from the reader. Thus, in the first layer, Frenum Mala is behind or farther away than Urna Mala; in the second layer, Ostrum is in front, Uncus behind it, and Ala behind Uncus. Third, or {Mars Mala Merces Mala Tyro Mala Top {Spicula Mala Mora Mala Oliva Mala Floor. {Comes Mala Tibicen Mala Vestis Mala Second, or{Ala Mala Cortis Mala Aer Mala Middle {Uncus Mala Pallor Mala Tergum Mala Floor. {Ostrum Mala Bidens Mala Scena Mala First, or {Sector Mala Hama Mala Remus Mala Bottom {Frenum Mala Plebs Mala Sypho Mala Floor. {Urna Mala Moles Mala Saltus Mala These names should be learnt so that the different cubes in the block can be referred to quite easily and immediately by name. They must be learnt in every order, that is, in each of the three directions backwards and forwards, _e.g._ Urna to Saltus, Urna to Sector, Urna to Comes; and the same reversed, viz., Comes to Urna, Sector to Urna, etc. Only by so learning them can the mind identify any one individually without even a momentary reference to the others around it. It is well to make it a rule not to proceed from one cube to a distant one without naming the intermediate cubes. For, in Space we cannot pass from one part to another without going through the intermediate portions. And, in thinking of Space, it is well to accustom our minds to the same limitations. Urna Mala is supposed to be solid Gold an inch each way; so too all the cubes are supposed to be entirely of the colour which they show on their faces. Thus any section of Moles Mala will be Orange, of Plebs Mala Black, and so on. [Illustration: Fig. 10.]