MEMOIR OF N. II. WINCHELL 29 



eighteen years, 1888-1905, in two volumes yearly, forming a series of 

 thirty-six volumes. This work, in which he was much assisted by Mrs. 

 Winchell, greatly promoted the science of geology, affording means of 

 publication to many specialists and amateurs throughout this country. 

 It also brought out many biographic sketches, with portraits, of the prin- 

 cipal early American workers in this wide field of knowledge. 



In one of the bulletins of the Minnesota Geological Survey, entitled 

 "The Iron Ores of Minnesota," 430 pages, with maps, published in 1891, 

 Prof. N. IT. Winchell had the aid of his son, Horace Vaughn Winchell ; 

 and in a text-book, "Elements of Optical Mineralogy," 502 pages, 1909, 

 he was associated in authorship with his younger son. Prof. Alexander 

 Newton Winchell, of the University of Wisconsin. During parts of the 

 later years of the Minnesota survey he was aided by his son-in-law, Dr. 

 Ulysses S. Grant, professor of geology in the jSTorthwestern University, 

 Evanston, Illinois. 



In 1895-1896 Professor and Mrs. K. H. Winchell spent about a year 

 in Paris, France, and again he was there during six months in 1908, his 

 attention being given mainly during each of these long visits abroad to 

 special studies and investigations in petrology. 



Por the Geological and Natural History Survey of Minnesota, Pro- 

 fessor Winchell published twenty-four Annual Reports, being one each 

 year for the years from 1872 to 1894, inclusive, and the last in this series 

 being for the years 1895-1898, published in 1899. These reports of 

 progress of the survey range in size from 42 pages to 504 pages, com- 

 prising many very important papers on the observations of the geology 

 of all parts of the State; also on its ornithology, entomology, botany, 

 paleontology, etc., by Professor Winchell and his assistants. In the last 

 of these annual reports a general index of all the series fills 106 pages. 



Ten bulletins of this Survey were published in the years 1887 to 1894, 

 inclusive, ranging from 37 to 430 pages, the largest being on "The Iron 

 Ores of Minnesota," before mentioned, and the last, by J. Edward Spurr, 

 "The Iron-bearing Pocks of the Mesabi Range in Minnesota," 268 pages. 



The final reports of the Geology of Minnesota form six quarto vol- 

 umes, and the third of these volumes, on Paleontology, is bound in two 

 parts. Volume I, ])ublishcd in 1884, comprises the reports of the coun- 

 ties in the southern third of the State; Volume II, published in 1888, 

 treats of the counties in the next third part of the State, jn-occeding 

 northward, and Volume IV, publisliod in 1S9!», contains reports on the 

 rnoro noiihci-n counties, including tlic great belts of iron-ore deposits 

 called the \'ci'iiiilioii and Mesabi ranges. Volume V, 1900. by N. H. 

 Winchell and 1'. S. (|i-ant, deals willi (lie structural and petrographic 



