Thanks CD for subsidence references in response to HHH’s Nature paper ["The distribution of volcanoes", 9 (1874): 141–2].

Hopes to refer to CD’s having previously suggested the corresponding elevation of continents and sinking of the larger oceans in his next letter to Nature [9 (1874): 201–2]. Occurrence of volcanoes at boundary between rising and sinking lands reconciles his views with CD’s.