Corrigenda in Vol. XXX., Art. LIV.

Mr. J. A. Erskine, M.A. and Ex.1851 Sc. Scholar., has sent from London the following corrections to his paper:—

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• Equation, line 3. For L₂ read i₂.

• Equation, line 7. For L_s read i_s.

• Equation, line 11. For dt₂/dt'dt₁/dt'dt_s/dt read di₂/dt'di₁/dt'di_s/dt'

• Equation line 11. For R₂ L₂ read R₂ read i₂.

• Equation line 13 (on left side). For L₂ read i₂.

• Line 15. For L₂ read i₂.