infusorial earth वाक्य
"infusorial earth" हिंदी में infusorial earth in a sentenceउदाहरण वाक्य
- These researches had an important bearing on some of the infusorial earths used for polishing and other economic purposes; they added, moreover, largely to our knowledge of the microorganisms of certain geological formations, especially of the chalk, and of the marine and freshwater accumulations.