In addition to the caves in the localities above alluded to there are other places near Paris where the culture is carried on—notably at Moulin de la Roche, Sous Bicêtre, near St. Germaine, and also at Bagneux. The equability of temperature in the caves renders the culture of the mushroom possible at all seasons; but the best crops are gathered in winter, and consequently that is the best time to see them. I, however, saw abundant crops in the hottest part of the very hot season of 1868. These mushroom caves are under Government supervision, and are regularly inspected like any other mines in which work is going on. As regards the depth at which this culture is practised, it usually varies from twenty to one hundred feet, sometimes reaching one hundred and fifty and one hundred and sixty feet from the surface of the earth. They are so large that sometimes people are lost in them. In one instance the proprietor of a large cave went astray, and it was three days before he was discovered, although soldiers and volunteers in abundance were sent down. Is it possible that in a great mining and excavating country like ours we cannot establish the same kind of industry?
CHAPTER VII.
CULTURE ON PREPARED BEDS IN THE OPEN AIR IN GARDENS AND FIELDS.
Mushrooms may be grown with ease in the open air in gardens; and this is a phase of the culture with which gardeners are not by any means sufficiently conversant. In fact, mushroom-culture in the open air in private gardens may be said not to exist at present, so very rarely is it seen.
In a little pamphlet on mushroom-growing that has lately appeared I find it stated that mushrooms may be grown out of doors “in summer,” but nothing about them being grown in the open air in winter. The Paris growers never attempt their culture in summer: the London ones very rarely. It is in winter that their cultivation is carried on in full vigour in the open air. Abundant crops are grown in the open air by the market-gardeners of London and Paris. From their beds mushrooms are gathered in quantities in mid-winter as well as in autumn. The Paris market-gardener does not attempt the culture in mid-summer, and does not think it practicable; but in the hot summer of 1868, and in the midst of the heats of July, I found about half an acre of ground at Brompton covered with mushroom-beds bearing well.
The following [illustration] is from a sketch taken in Nov. 1869, in market-garden fields, between Kensington and Brompton. The beds, about three and a half feet high and the same in width at the base, are covered with the long straw or litter taken from the stable manure. Over that is placed old bast mats, or any like materials, to keep the litter in its place, and throw off the rain; the mats being kept in place by tiles, bricks, old boards, or any like objects that may be at hand. This is well shown in my illustration.
The manure employed is that brought from the London stables, the longer litter being shaken out and put on one side to cover the beds. No care whatever is taken in the preparation of the manure; it is usually made into beds soon after it is brought home and before it is allowed to heat, and then the beds are made in the form of potato-pits and beaten very firm. The beds are spawned when at about a temperature of eighty degrees, the pieces of spawn being placed about a foot or so apart, and it is then immediately earthed, the ordinary soil being used, and the bed covered to a thickness of a couple of inches. The success attained by the market-gardeners of both London and Paris, with the ordinary soil of the place in which the beds may be made, well proves the absurdity of seeking for any particular kind of soil for covering mushroom-beds. Beds made in this way in the autumn and winter months, and covered with a thick layer of litter and mats, seldom require any watering. The culture is not usually attempted in summer; the heat acting upon the littery covering giving rise to insects which destroy the mushrooms; but with care their culture is quite practicable at that season; in proof of which I may say that during the last week of July, 1868, I saw them gathered freely in a market-garden just beside the Gloucester Road Station of the Metropolitan Railway, where by using a coating of litter about a foot thick, and over that a layer of mats, it was possible to procure them in good condition throughout the hottest summer within memory. There are many acres of ground covered with beds made thus in the market-gardens round London.