Gazette, if any, and in the manner provided for the proclamation under section 6.

Extinction of rights not claimed -Rights in respect of which no claim was preferred under section 6 within the period fixed under that section shall stand extinguished on the publication of the notification under section 15 unless, before the publication of such notification the person claiming them has convinced the Forest Settlement Officer that he had sufficient cause for not preferring such claim within that period in which case the Forest Settlement Officer shall proceed to dispose of the claim in the manner herein before provided.