18. If, when the Collector proceeds to make the inquiry as mentioned in sections 14 and 15, no claimant attends, or if any person whom the Collector has reason to think interested does not attend, the Collector shall hold a proceeding and record the following particulars:- (a) the nature and extent of the property of which the value has been diminished and in respect of which compensation is claimed, and the character an extent of the damage done; (b) the names of the persons whom he has reason to think interested in such property; (c) the amount fixed by him as compensation; and (d) the grounds on which such amount was determined;