Air, water and food from a sanitary standpoint / by Ellen H. Richards and Alpheus G. Woodman.

  • Richards, Ellen H. (Ellen Henrietta), 1842-1911.
Date:
[1904], [©1904]
Catalogue details

Licence: Public Domain Mark

Credit: Air, water and food from a sanitary standpoint / by Ellen H. Richards and Alpheus G. Woodman. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    ice in a pond 40 or 60 feet deep. In this case the impurities have been excluded. This crystal ice is impermeable to air and therefore to what air carries, and of course to water and what it carries. An equally safe rule is to discard all snow-ice made from snow saturated with water. The increasing difficulty of obtaining safe water has caused an increasing use of distilled water obtained either from domestic stills or in bottles or carboys from manu- facturers. The latter is often a desirable source of drink- ing-water if the glass does not scale off from the bottles. A very little common salt may be added if the consumer prefers, or even a drop or two of the druggists' lime- water. The domestic still, if made from a poor quality of metal, may bring an evil second only to that of polluted water. Lead should not enter into its construction.