Sentence:  I would advise you to accept these as an instalment of a volume, (they are not big enough to make one themselves) with the promise that the stories to come should be more striking, more original in theme &mdash; not less so, not mere <WSD>makeweights</WSD> &mdash; than those under consideration. 
Meaning of the word marked with <WSD> tags:  Something of inferior quality which is included in a shipment to make up the weight.