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1. The first part of this investigation dealt only with the crystals of calcite and magnesite because the method there considered required a knowledge of theintrinsic repulsive forces between all the constituent ions, and this information was not available for the other crystals of the calcite type. The two carbonates considered fall in a different category from the rest, in that their metallic ions possess a special property. They are similar in electronic structure to inert gases, and it is this property which has permitted (in a way described in earlier papers!) of the determination of their fields of force. The positive ions of the other carbonate crystals—-of calamine (ZnCO3 ), of chalybite (FeCO3 ), and of rhodochrosite (MnCO3 ) for instance—are not of this simple type and their fields have not as yet been found. Nor has any direct method of supplying this information been proposed, so that any indirect methods which may be suggested assume an added interest. It is the object of this paper to explore the possibilities of determining the repulsive fields of these more complex ions by an examination of the properties of the carbonate crystals themselves. The preceding part of this investigation adduced reasons for supposing the distance between the C++++ ion and the force centre of an O¯ ¯ ion in the CO3 group to be 1• 08 Å. This conclusion referred to the CO3 groups in calcite and magnesite. Now the internal forces binding the ions in these groups are so great, that we may safely assume that the structure of these groups is but little affected by the influence of the metallic ions with which they combine. The conclusion of the preceding part regarding the size of the CO3 group may then be considered to hold also for the crystals of ZnCO3 , FeCO3 , MnCO3 and CdCO3 .

Some theoretical determinations of the structure of Carbonate Crystals.—II