Explain four categories of unascertained goods.
The posho mill is diesel propelled and when in use causes a lot of vibrations. Recently, as a result of the vibrations from the posho mill, a beam fell from the roof of the adjoining house occupied by Nabayi and injured her. Nabayi claims that the vibrations of the posho mill have been a nuisance and has as a result sued Namweya for damages.