164 W. Crookes on the Wax paper Photographie Process. 
to heat the water over a charcoal or coke fire, in preference to 
using gas for this purpose. | 
16. 
ckets. 
P'The measures should be of glass, graduated, the pint and half 
pint into ounces, the ounce measure into drachms, and the — 
drachm measure into minims; they should be rather long in © 
proportion to their width. ee ~ a 
"he Florence oil flasks, which can be obta 
btained | ra trifle ab 
any warehouse, will be found to answer ws ge nearly as 
hey must be 
done by 
well as the more expensive German flas 
cleansed thoroughly from the adhering oil; this may be 
boiling in them, over the gauze gas burner, a strong soluti 
ordinary washing soda, and afterwards well rinsing out ¥ 
