Information from the Publisher:

There are a large number of Spider Remedies that have been proved and are now available and it is often difficult to differentiate between them. With the Spider Remedies the need for extremely precise and careful differentiation seems to be even more important than it is with other remedies. When a Spider Remedy is called for, those that are not exactly correct will often have very little or no significant effect and only the one that is indicated will be effective.
This book includes an understanding of the general Spider picture that will show the need for a Spider Remedy. It also includes a detailed picture of the known Spiders and their distinguishing features which can be used to differentiate between them.

Transformation between the Realms
The remedies that move between the Realms of Sea, Earth, Sky and Underworld have a particular dynamic relationship to that transformation. Understanding this dynamic helps to understand the group as a whole and to find the subtle difference between its members. Groups include the Insects, the Birds, the Spiders, the Snakes, the Lacs, the Drugs and the Trees.