62 THE SEED-GROWER. 
heat of the dung may be diffused through them, the 
temperature not being allowed to get above 60 degrees. 
The spawn will soon begin to run, and when it has 
spread itself to every part of the brick, looking like 
white mould (ascertained by breaking one or two 
bricks), the operation of spawning is considered finished. 
The bricks are then taken out and allowed to become 
perfectly dry. ; 
They should be stored in a cool, dry, dark place; 
kept in this way, mushroom spawn will hold its vitality 
five years. 
MUSTARD. 
This is a one season’s crop and easy to raise. Sow 
seed in early spring, in drills two feet apart, thinning 
to eight inches in the row. Rogue carefully, pulling 
out all plants which are impure; keep the crop free 
from weeds. Harvest, thresh and clean after the 
manner as described for kale or borecole, te which 
refer. 
Sold by seed-dealers generally, the greatest demand 
being from the Southern States. The most of the seed 
used is grown in the South, the remainder in Cali- 
fornia. 
In a favorable season a yield of seed is from 1,500 to 
2,000 pounds per acre; at prices to the grower, for gar- 
den varieties, of twelve to fifteen cents per pound. 
OKRA. 
This annual does best in a light, rich soil. Sow seed 
in early spring, in rows three to five feet apart, accord- 
ing to variety, and when plants are six inches high, 
thin out to fifteen inches between the plants for dwarf 
varieties, three feet for the tall. Rogue by pulling out 
