1. The concentrations of Na+ and K+ in the haemolymph remain relatively constant during the moulting cycle.

  2. Desiccation, desiccation followed by rehydration and starvation exert little or no effect on the concentrations of Na+ and K+ in the haemolymph.

  3. The volume of haemolymph decreases during desiccation and increases after rehydration.

  4. More Na+ is voided in the excreta during desiccation.

  5. Repeated desiccation and rehydration causes the loss of both Na+ and K+ from the body.

  6. The effects of desiccation and rehydration on the concentrations of chlorides and free amino acids in the haemolymph are described.

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