14 
3IEASUEEN’G MICROSCOPIC OBJECTS— 
1. Eye-piece micrometer. 
2. Stage micrometer. 
3. PhotograpMc method. 
Glass Blowts'g — 
1. The blowpipe. 
2. Pipettes. 
3. Bulbs. 
4. Welding. 
5. Sealing and opening glass containers. 
6. I^Iahing test tabes. 
7. flaking perforated tnbe.s for collodinm sacks. 
Folding Papke Filtkes. 
Peepaels-g Bacteeiologic Filtees (Pees-ciples akd Peactice 
1. Kaohn. 
2. Diatomaceons earth. 
3. Asbestos. 
4. Sand filtration. 
