Test tubes of water (taken to show deposits)

Fort Street High School. Chemistry

Testing milk

Cream testing room. Grafton Butter Factory

Womens Training Farm, Cowra, test tubes

Testing milk

Test tubes of water (taken to show deposits)

Milk testing

Test tubes of water (taken to show deposits)

University of Technology (Sydney Technical College)

Test tubes of water (taken to show deposits)

University of Technology (Sydney Technical College)

Test tubes of water (taken to show deposits)

Bordeaux mixture test at Agricultural Department

Test tubes of water (taken to show deposits)

Test tubes of water (taken to show deposits)

Testing milk

Test tubes of water (taken to show deposits)

Test tubes of water (taken to show deposits)