Access
To read this article in full you may need to log in, make a payment or gain access through a site license (see right).
Article
Nature 161, 297 (28 February 1948) | doi:10.1038/161297d0;
nature jobs
Chemical Process Engineer
- Praj Matrix - Praj Industries Ltd
- Pune, Maharashtra Pune-411021 India
Assistant / Associate Professor
- Yale University
- New Haven, CT
The Gemmologists' Compendium
Abstract
IT is ten years since this Compendium first appeared. Much additional matter has been incorporated in the new edition.
To read this article in full you may need to log in, make a payment or gain access through a site license (see right).

