Philadelphia College of Pharmacy, Philadelphia College of Pharmacy and Science · Philadelphia : Philadelphia College of Pharmacy · leaf 105
99 THE PROCESS OF PERCOLATION. … tube is inserted into the India-rubber tube below. A piece of thread being then tied loosely round the India rubber portion may be made into a good compression stop-cock, by inserting a little wedge of wood between it and the India-rubber tube. The farther this wedge is pushed in, the more it…
Pharmacy · Pharmacology
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
