This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
The plants are generally dispatched in their pots, so that they are ready for immediate sale by the retailer, but occasionally, when sent long distances and to avoid cost of carriage, they are sent out of pots and each one papered up. In this case only well-rooted plants should be sent, or during transit the soil will drop off and so cause delay to the buyer, who has then to re-establish them before he can sell. Early in the season large numbers can be sent by parcel post with the roots packed in damp moss.