Seven classes of criminals were established in 1826, when the new barracks for prisoners at Hobart Town were finished. The first class were allowed to sleep out of barracks, and to work for themselves on Saturday; the second had only the lastnamed indulgence; the third were only allowed Saturday afternoon; the fourth and fifth were refractory and disorderly characters to work in irons; the sixth were men of the most degraded and incorrigible character to be worked in irons, and kept entirely separate from t