Public agitation against the restriction became so strong that the postal authorities, although apparently holding the view that a general parcel post was indefensible in principle, became fearful that, unless the public were given some concession on this point, an attack might be made on the 1d. rate for ordinary letters. Such an attack, if successful, would of course have been fatal to Post Office revenue. It was proposed, therefore, to make definite provision for the transmission by post at low rates of postage of small packets containing articles other than samples. A rate for small parcels, whatever the contents, would at the same time remove the difficult and unsatisfactory task of deciding what was or was not a sample or pattern. These objects might be secured by a general reduction of the rates for inland letters; and this course was ultimately adopted, after some hesitation from fear of the effect on the revenue. The rates on the heavier inland letters were accordingly reduced by Treasury Warrant of 16th August 1871, and the sample post at the same time abolished.[504] In the early 'eighties there was a strong demand from the public for the re-establishment of the sample post. The advantage to trade was emphasized, and attention was called to the existence of a privileged rate for samples on the Continent and in the international service. The existence of a low sample rate in the international service led, indeed, to a curious development. As samples which, if posted in this country, would be charged 2d., could be posted on the Continent for foreign transmission at a charge of 1d., several firms in England were in the habit of sending large numbers of sample packets in bulk to Belgium, where they were posted at the 1d. rate addressed to places in England. The result of this man[oe]uvre was that, instead of receiving the inland postage of 2d. for these packets, the British Post Office performed practically the same service in respect of them as if they had been posted in England, but received nothing, since under the Postal Convention the whole of the postage on foreign letters is retained by the country of origin. It was estimated that there was in this way a loss to revenue of £1,000 a year.