According to a revised mining law of 1899 (subsequently amended), all mines are required to be in charge of certified mine managers, mine examiners, and hoisting engineers, when the services of the engineers are necessary; and every mine must have an escapement shaft distinct from the hoisting shaft. The number of men permitted to work in any mine not having an escapement shaft cannot, in any circumstances, exceed ten during the time in which the escapement or connexion is being completed. Economic conditions have also led to an increase of administrative boards. A State Civil Service Commission was created by an act of the General Assembly of 1905. A Bureau of Labor Statistics (1879), whose members are styled Commissioners of Labor, makes a study of economic and financial problems and publishes biennial reports; a Mining Board (1883) and an inspector of factories and workshops (since 1893) have for their duty the enforcement of labour legislation. There are also a State Food Commission (1899) and a Live Stock Commission (1885). A Board of Arbitration (1895) has authority to make and publish investigations of all facts relating to strikes and lock-outs, to issue subpoenas for the attendance and testifying of witnesses, and "to adjust strikes or lock-outs by mediation or conciliation, without a formal submission to arbitration." The employment of children under 14 years of age in factories or mines, and working employees under 16 years of age for more than 60 hours a week, are forbidden by statute. The state has an excellent "Juvenile Court Law," which came into force on the 1st of July 1899 and has done much good, especially in Chicago. The law recognized that a child should not be treated like a mature malefactor, and provided that there should be no criminal procedure, that the child should not be imprisoned or prosecuted, that his interests should be protected by a probation officer, that he should be discharged unless found dependent, delinquent or truant, and in such case that he should be turned over to the care of an approved individual or charitable society. This law applies to counties having a minimum population of 500,000. The legal rate of interest is 5%, but this may be increased to 7% by written contract. A homestead owned and occupied by a householder having a family is exempt (to the amount of $1000) from liability for debts, except taxes upon, and purchase money for, the same. Personal property to the value of $300 also is exempt from liability for debt. Grounds for divorce are impotence of either party at time of marriage, previous marriage, adultery, wilful desertion for two years, habitual drunkenness, attempt on life, extreme and repeated cruelty, and conviction of felony or other infamous crime. The marriage of cousins of the first degree is declared incestuous and void. In June 1907 the Supreme Court of Illinois declared the sale of liquor not a common right and "sale without license a