With respect to the liberty of the slaves the code of 1798 clearly shows that the existing type of slavery was purely rural, for the restrictions on slaves concerned only the plantation Negroes. Strictly understood, the slave was not to leave the farm of his owner without a pass from his master, the main purpose being to keep the Negroes from congregating on any one farm. Later when emissaries from the North became unusually active the rights and privileges of the slaves were further restricted. This change was due to the current belief that these foreign individuals were bent upon stirring up strife among the slaves and inciting them to insurrection. Once started such a scheme would have resulted in anarchy especially in the towns. The real curbing provisions were not started until along in the thirties when these outside forces had begun to make their appearance in the urban communities.[301] In some parts of the State were instituted mounted patrols, who went about at night and watched the movement of slaves. They were to apprehend any servant who was caught away from his home plantation without a pass from his master.[302] Such an institution was based on good Negro psychology, for his fear of the spirits of night was well known. Citizens of that time have told us many tales of the dread which the slave had of meeting these night raiders whom they termed "patter-rollers" and how they came to sing of them in true Negro fashion: Over the fence and through the paster, Run, nigger, run, oh, run a little faster, Run, nigger, run, The patter-roller ketch you. Such a system of county patrols did not prove to be sufficient as the slave population grew and the towns became larger and more attractive to the country slave. The legislature of 1834 in drawing up a law concerning tavern keepers had this problem clearly in mind when they provided that no person should sell, give or loan any spirituous liquors to slaves, other than his own, under a penalty of $10 for each offense. Furthermore, if the offender was a licensed liquor dealer, he should have his license taken away from him for the term of two years.[303] That even this measure did not prove effective enough to curb the evil of Negroes congregating in the towns is shown by the further provision passed March 6, 1850, to increase the fine to $50 for each offense.[304] A still further extension was that of February 27, 1856, which provided that free Negroes were to be included in the restriction unless they presented a certificate from "some white person of respectable character." No slaves or free Negroes were to be employed in the selling or distribution of liquor nor were they to be allowed to visit or even loaf around any place where intoxicants were kept for sale.[305] The session of 1858 made the force of the law more explicit by defining very clearly the jurisdiction in such cases.[306]