A method for producing a silicon nitride honeycomb filter, which comprises heat-treating in a nitrogen atmosphere a green body comprising from 50 to 85 mass % of metal silicon particles having an average particle diameter of from 5 to 50 \u03bcm, from 5 to 30 mass % of glass hollow particles having a softening temperature of from 400 to 1000\xb0 C. An interior compartment contains the pourable substance. Another embodiment provides for a fixed valve ejector with a bias towards discharging to ambient, but with a fan on the downstream side of said vapor generator for overcoming this bias. By providing such exercise apparatus, a user can move the upper body assembly with respect to the bicycle’s seat mount to exercise the user’s trunk while moving the arm-shoulder device to exercise the arms and shoulders. \u2018Darlington\u2019 is an iceberg lettuce variety exhibiting stability and uniformity.