152 PROCEEDINGS OF THE INDIANA ACADEMY OF SCIENCE. 



CoUett, however, in the introduction to the volume, mentions this paper as 

 follows: "The Rev. Dr. Curtis has given the results of years of careful 

 research in the microscopic study of the animalculae which have their habitat 

 in the potable waters of Indianapolis and vicinity. B^■ these figures every 

 one can see the forms of the animals which it delights his soul to swallow. 

 These drawings have been submitted for criticism to the best experts in 

 diatomacean forms, and are pronounced bj^ them to be good, while the 

 accompanying descriptions and nomenclature are fully up with the advanced 

 knowledge in natural history." 



Fourth Report of Collett. 



The foiirth report of Collett, entitled "The Thirteenth Annual Report of 

 the Indiana Department of Geology," was issued in 1S84. It was accompanied 

 by the first colored Geological Map of the State issued bv a State Geologist. 

 This was on a scale of nine miles to the inch and showed on the margins a 

 vertical section of the exposed strata of the State, and a horizontal section 

 across the State from Vincennes to LawTenceburg, near the Ohio and Missis- 

 sippi (now the B. & O. S. W.) railway. Of this map Collett A\TOte: "The 

 aecompanjnng geological map of Indiana gives a fair exhibit of the surface 

 geology of the State. It is a compilation of all the labors of my distinguished 

 predecessors and their assistants. Much of the geology of the northern and 

 northwestern areas is given, not accessible before the surveys of New ton and 

 Jasper (bounties. The map comprises over one hundred years of labor and 

 study of these devotees to science, as well as the results of thousands of miles 

 of travel with pick and hammer. It is believed that it will !)(■ appreciated by 

 our citizens as a chart giving years of study and labor, ((indciiscd in a single 

 sheet, and invaluable to teacher, student and citizen." 



In the introductory portion of the volume G. M. Levette has an article 

 on the "Fuel Value of (^oals," accompanied by tables of 392 analj'^ses of 

 Indiana coals compiled from the reports of Owen and Cox, and 57 analyses of 

 coals from other States for comparison. 



This is followed by the usual county reports, viz., Posey County by Col- 

 lett; Morgan, by R. T. Brown; Rush, by M. X. I^lrod; .Johnson, by D. S. 

 McCaslin and Grant by A. J. Phinney. These were eafh and all of the 

 usual tj'pe of county reports in the Cox and Collet t volumes, and contain 

 nothing worthy of especial mention in this review. 



A "Glossary of Terms commonly used in Geological Reports," suggested 

 and largely prepared by Dr. W. T. S. Cornett of Madison, Indiana, follows 

 and ends Part I of the volume. 



Part II is devoted to Paleontology and embraces two papers. The first, 

 entitled "Principles of Paleozoic Botany," by Leo Lesquereux, is accom- 

 panied 1)\ 22 plates illustrating the remains of the more important plants 

 of the coal measures of the State. Collett in an introductitm says: "As the 

 greatest riches of the minerals of Indiana lie in its coal beds, which ai*e en- 



