oil with the addition of 0 3 weight of nickel octoate neither a temperature rise nor a consolidation of the medium could be ascertained negative results were also obtained when operating under conditions similar to those of test no 2 but with an air flow rate of 1 5 liter minute measured under standard conditions and using as an organic mixture linseed oil with the addition of 0 06 weight of copper naphthenate a test similar to the test no 2 was effected using this time linseed oil with the addition of 1 68 weight lead in the form of naphthenate and 0 3 weight nickel in the form of octoate the test was performed under a relative pressure of 10 bars with an air flow rate of 3 liters minute standard temperature and pressure conditions after the test it was ascertained that the medium had kept its permeability and was properly consolidated its resistance to compression was 90 bars thus the utilized catalyst gives excellent results in the consolidation of the solid medium a test similar to the test no 2 was effected using this time as an organic mixture linseed oil with the addition of 1 68 weight lead and 0 12 weight copper both in the form of naphthenate the test was performed under a relative pressure of 10 bars with an air flow rate of 3 liters minute measured under standard conditions during 7 hours 40 minutes the reaction caused a temperature rise from 20 u00b0 to 260 u00b0 c at the end of the test it was ascertained that the medium has kept its permeability and was perfectly consolidated its resistance to compression was 92 bars a test was performed under operating conditions similar to those of test no 2.