STATE AND LOCAL TAX REVENUES 109 four cities is also shown in this table. For the fiscal year ended in 1928 the general property tax accounted for 89.0% of the total tax receipts of the four cities, as compared with 91.8% in 1923 and 82.29% in 1913. The smaller proportion in 1913, as well as in 1918, was due to receipts from liquor licenses, which in Table 33 are classified as business licenses. Because of the adoption of the national prohibition amend- ment, the receipts from business licenses were lower in 1923 than in 1918. In later years they have increased, but relatively they have not attained so important a place in the revenue system of the cities as they held before the eighteenth amendment became effective. Of the cities for which data are presented in Table 33 only Springfield collects a poll tax. This source accounts for only about 19 of the tax revenues of that city. Non-business licenses in recent years have accounted for only about 29%, of the tax revenues of the four cities. Although special assessments are not regarded as taxes in economics or in law, they deserve mention in connection with the other data for the four cities. In theory, a special assessment represents a charge made against property be- cause certain improvements made or to be made tend to increase the value of the property proportionately. This form of contribution is particularly important in financing certain types of municipal improvements. Collections on account of special assessments are ordinarily irregular in amount. For example, in 1928 the four cities collected from this source about $6.2 million and in 1927 more than $6.8 million, but in 1926 the total was only slightly in excess of $4.7 million. As a basis for interpretation, ratios of special assessments collected to general property taxes and to total taxes were computed. These ratios comprise the lower half of Table 34. The ratios were found to be much higher for the year 1913 than for any other year, indicating a relative decline of this source of urban revenue. In 1928 special assessments collected in the four cities were equivalent to only 129, of general property taxes and 10.7% of total taxes from all sources. Since 1923 Kansas City has made less use of special assessments than St. Louis. On the other hand, St. Joseph