crop. I have given this
question much painstaking and practical consideration, and have
absolutely failed to revive a "dead" bed. I have not been able to do it
myself, and any instance of its having been done has never come under my
observation. This may appear heresy anent the multitudinous writings to
the contrary.

A mushroom bed may keep on bearing in a desultory way for many months,
and now and again show spurts of increased fertility; but this is no
second crop; it is merely a prolonged dribbling of the first crop. A
bed, by reason of cold or dryness, may, as it were, stand still or
partially stop bearing, and soon after it is remoistened, warmed, and
otherwise submitted to congenial conditions, will display renewed
energy; but this is no second crop; it is merely a spurt of the first
crop caused by extra favorable cultural conditions. But to show how
vaguely this question which is so much written about is regarded, let me
quote from a letter to me by Mr. J. Barter, who grows 21,000 lbs of
mushrooms a year for the London market: "You ask me, 'Do you ever get a
second crop?' My beds last in bearing, on an average, each three months,
and that I reckon to be three crops. But whether it be three or six
months, the weight of mushrooms is about the same. As there is in, say
a ton of manure, only so much mushroom-producing power, if you force it
to produce that weight in two months you are a gainer, as you thereby
save in labor; but when that producing-power is exhausted it will
produce no more mushrooms."

A spent mushroom bed is one that has been kept in bearing condition
under the most favorable circumstances at our command, and it has borne
a good crop, lasted some two months in bearing, and now it has stopped
bearing (except in a meagerly, desultory way) because the spawn or
mycelium has exhausted itself and is dead. Then, without living spawn in
the bed how are we to get mushrooms? Some bits of mycelium are still
alive and yield the desultory few, but every mushroom that they yield is
preying on their vitality, and after a time they too shall die and the
bed be completely barren, for the mycelium is altogether dead, and
without mycelium mushrooms are an impossibility. We can keep mushroom
mycelium in active growth the year round, and year after year, providing
we never let it bear mushrooms. This is done by taking the mycelium,
just before it begins bearing, from one manure bed and plant it in
another, and so on