Continued from the previous report, a supplemertary field test was performed to study the influence of the thickness of the sampler tube upon the disturbance of saturated alluvial clay samples, using a new type boring machine. 1.5 meter long sampler guide was attached to the sampler and no rotation was applied to the sampler before pulling outside. The results are summerized as follows:
　i) The newly made machine with 80 centimeter stroke of oil-feed type spindle enabled to penetrate the sampler continuously at a uniform speed and to obtain less disturbed clay samples.
　ii) The thickness of the sampler tube with a range from 1 to 5 milimeter had no influence upon the unconfined compression strength and the modulus of elasticity of clay samples.
　iii) The strain at failure and the crack within the sample were the least with sampler tubes of 1.5 to 3 milimeter in thickness.