The index of r efraction, the absorption and dispersio~ are . studi ed fo~' sev~eral gase and vapors (prcssur e from 0 to 1 atm, temperatu:c ~rom 0 to 50 , C, flequency fJ om 1,000 to 12,0~0 Mc/s) , TJle first part is d evoted to a descnptl,on ,of tl~e I1: L crowave spectrom eter uscd: wh Il e the second part is a s urvey of the several theon es lluphed 111 tl,le lIlterPTetatIOIl of the Jes uIts:In the third part we present first the results concermll g t he llld ex of refrB:ctlon, of atmospheri c gases, of dl~y air , and of damp air, Then we st ud~' the abso:rptIOll and ,ciIspcrsIOll by several vapors, and of ammonia and chloroform, prmclpall y. FlOally, we lIldlCate a new m ethod making use of gaseous mixtures. , .. " Our original results are disc u sed and presented \\"lthlll the fram e of r efer ence of wOlks of other authors by means of comparison and intens ive bibliographies.
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