| Temperature. ºC. | η | Z found. | Z calculated. |
| 50 | 0.0283 | 228 | 228.00 |
| 45 | 0.0305 | 246 | 246.55 |
| 42 | 0.0352 | 284 | 266.75 |
| 38 | 0.0368 | 297 | 289.00 |
| 34 | 0.0410 | 330 | 313.06 |
| 30 | 0.0419 | 339 | 339.00 |
| 26 | 0.0445 | 359 | 367.80 |
| 22 | 0.0492 | 398 | 396.47 |
| 20 | 0.0511 | 412 | 412.00 |
| 18 | 0.0531 | 428 | 428.00 |
EFFECT OF TEMPERATURE UPON VISCOSITY.--GUM VIII.
| Temperature. ºC. | η | Z found. | Z calculated. |
| 50 | 0.0430 | 347 | 347 |
| 46 | 0.0475 | 383 | 371.14 |
| 42 | 0.0502 | 405 | 397.09 |
| 38 | 0.0510 | 411 | 424.73 |
| 34 | 0.0575 | 463 | 454.06 |
| 30 | 0.0602 | 485 | 485 |
| 26 | 0.0637 | 513 | 517.82 |
| 22 | 0.0667 | 538 | 552.25 |
| 20 | 0.0707 | 570 | 570 |
| 18 | 0.0755 | 609 | 583.07 |
The constants for the first gum are those given in the preceding column, while for the latter they were--
A = 771.9: B = -11.15: C = 0.053
As will be observed, the effect of heat appears to be the same upon the two typical gum arabics quoted above, an increase of temperature from 18° C. to 50° C. decreasing the viscosity by nearly one half in both cases, and the same seems to be true of most gum arabics. Roughly also the same holds good for Ghattis, as the following numbers show:
| Gum. | Z at 18° C. | Z at 50° C. |
| Gum arabic. | 1016 | 579 |
| Gum arabic. | 428 | 228 |
| Gum arabic. | 609 | 347 |
| Gum arabic. | 581 | 258 |
| Ghatti. | 572 | 306 |
| Ghatti. | 782 | 418 |
The following table shows the effect of heat upon the viscosity of a typical Ghatti:
GHATTI GUM NO. 15.--VISCOSITY.
| Temperature. °C. | η | Z. |
| 50 | 0.0517 | 418 |
| 46 | 0.0581 | 468 |
| 42 | 0.0628 | 506 |
| 38 | 0.0726 | 585 |
| 34 | 0.0788 | 635 |
| 30 | 0.0857 | 691 |
| 26 | 0.0889 | 717 |
| 22 | 0.0919 | 741 |
| 20 | 0.0946 | 763 |
| 18 | 0.0964 | 777 |