Truax-Traer Coal Co. for his helpful suggestions and for supplying the coal used in this investigation. A special thanks is given to Marjorie L. Sutherland, statistical consultant, whose help and guidance made possible a thorough analysis of the data. NOMENCLATURE Cake moisture = wt. % total moisture Air rate = CFM/sq. ft. CF/sq. ft. = cubic ft. of air/sq. ft. of filter area drawn through cake and measured at std. conditions of 1 atm. and 32°F. CFM/sq. ft. = cubic ft. of air per min./sq. ft. of filter area drawn through cake and measured at std. conditions porous beds.

The complete synthetic medium for the growth of Tetrahymena pyriformis E was subjected to gamma‐radiation from cobalt60. A dose‐response curve indicated the range of radiation which damaged the medium so that growth of Tetrahymena was inhibited. The essential vitamins and amino acids which comprise the medium were individually irradiated in solution. Media were prepared with single irradiated components and tested for their ability to support growth of the protozoa. Thiamine, riboflavin, pantothenate, pyridoxine, folic acid, and thioctic acid were destroyed by less than 1 × 106 rep, while 2 × 106 rep was required to inactivate nicotinic acid. Most amino acids proved to be relatively radiation‐resistant. At the high radiation levels of 1 × 107 rep and 2.3 × 107 rep respectively, only serine and methionine were damaged. All other amino acids remained biologically active even after receiving 2.3 × 107 rep, the highest level of radiation employed. Organoleptic observations, however, showed radiation‐caused color and odor changes in many of those amino acids whose biological activity for Tetrahymena was unaffected. The nucleotide, guanylic acid, was also inactivated at 2.3 × 107 rep.

SUMMARYTwo l a r g e l y s i m e t e r s were i n s t a l l e d i n t h e s o i l o f t h e Hanford R e s e r v a t i o n t o g a t h e r d a t a on t h e a c c u m u l a t i o n and p e n e t r a t i o n o f m e t e o r i c w a t e r . T h i s r e p o r t d e s c r i b e s t h e c o n s t . r u c t i o n d e t a i l s o f t h i

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