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which are published in Vol. V. of the Transactions of the St. Louis Academy of Science.

In May, 1889, the act authorizing the present, or Third geological survey, was approved. It was evidently framed upon the laws of the preceding surveys, though it differed from them in detail. The most noticeable differences are the absence of a requirement to collect specimens in triplicate, and the absence of a clause requiring county maps and reports to be prepared. The state geologist is, however, directed to have complete and detailed maps and reports of counties or districts prepared. The appropriation for the two years, 1889 and 1890, was $20,000; that for 1891 and 1892 was $40,000; out of this all salaries and expenses were to be paid, including cost of publication. For the years 1893 and 1894, $20,000 have been appropriated, though the paper for publications is furnished in addition.

The writer was elected state geologist in August, 1889, and entered upon the discharge of his duties the end of September following. The plan of work adopted for this survey was: (1) to prepare a series of monographic reports upon separate subjects, which may be called Subject reports, applying to the whole state; those subjects of direct economic importance to receive first consideration; (2) to prepare successively a series of detailed maps of different portions of the state, and to accompany these with special reports containing much descriptive detail, which we may call Area or Sheet reports.

The subjects of work so far undertaken have been: the lead and zinc deposits; the coals and the Coal Measures; the clays; the iron ores; the mineral waters; the building stones; the crystalline rocks; the Quaternary, or, more exactly, the glacial geology; the paleontology; the hypsometry; general geologic mapping. Work has advanced on all of these subjects to varying extents. The study of the lead and zinc deposits was begun in coöperation with the national geological survey, but has been carried to completion by the state survey, and the report is now nearly finished. A Preliminary Report of 226