| |_______________|___________________|
| | | | | |
| | From | To | Increase. | Loss. |
|________________|_______|_______|___________|_______|
| | | | | |
| 1. Clear | 57° | 62° | 31 | ... |
| 2. " | 60° | 62° | 18 | ... |
| 3. Cloudy | 60° | 62° | 7 | ... |
| 4. Rain | 60° | 63° | 0 | 0 |
| 5. Clear | 58° | 62° | 15 | ... |
| 6. Rainy | 58° | 62° | ... | 2 |
| 7. Cloudy | 62° | 65° | ... | 10 |
| 8. Clear | 60° | 62° | 5 | ... |
| 9. Partly Clear| 50° | 60° | ... | 3 |
|10. " | 58° | 60° | ... | 10 |
|11. Cloudy | 58° | 60° | 8 | ... |
|12. Rainy | 58° | 60° | ... | 10 |
|13. Partly CLear| 50° | 58° | 20 | ... |
|14. Cloudy | 50° | 60° | 16 | ... |
|________________|_______|_______|___________|_______|

The lesson this table teaches is, that it is almost impossible to nitrate
cellulose in small quantities, and get uniform results, when the nitration
is carried on at high temperatures. As regards the solubility of
pyroxyline, Parks found that nitro-benzene, aniline, glacial acetic acid,
and camphor, dissolved in the more volatile solvents methyl-alcohol and
alcohol-ether, were much the best solvents for producing a plastic, as
they are less volatile, and develop greater solvent action under the
influence of heat. Nitro-benzene gives a solution that is granular; it
seems to merely convert the pyroxyline, and not to dissolve it; but on the