46 PROCEEDINGS OF THE ANX ARBOR MEETING 



fused to make loose generalizations or take matters for granted. In many 

 cases he withheld his acceptance of the results of his fellow-glacialists 

 until he had himself investigated the 23henomena. He was especially 

 guarded in giving his sanction to the current view that there have been 

 several stages of glaciation, separated by long interglacial stages. This 

 finds expression in his writings by the use of the words "so-called Kansan. 

 so-called lowan/' etcetera. The opportunity for detailed study of one of 

 the old drifts in Kansas, however, removed this uncertainty; so that in 

 his later years the Kansan was recognized as a distinctly older drift than 

 the Wisconsin drift, which had been his especial field of study before. 

 While his studies and writings were primarily scientific and educational, 

 he showed a determined purpose to bring out practical results and appli- 

 cations of geology to the needs of the commonwealths he served. This 

 is shown especially in his papers on the building stones, the water sup- 

 plies, and in the several geologic folios. While Professor Todd's main 

 field of labor was in the Dakotas, his report on the Quaternary of ]\[is- 

 souri and an unpublished report on the Quaternary of northeastern Kan- 

 sas represent a fuller study of these districts than has been made by any 

 otlier geologist. His contributions to Iowa, Nebraska, and Minnesota 

 geology are also important. 



For 40 years Professor Todd was actively engaged in teaching, and his 

 field investigations and writings represent merely what was done by him 

 outside his main occupation. He brought to the class-room the spirit of 

 investigation and of untiring zeal in the development of scientific knowl- 

 edge, and was held in high esteem by students as well as by his coworkers 

 and fellow-citizens. 



Bibliography - 



On the annual deposit of the Missouri River during tlie post-Pliocene. Amer- 

 ican Association for the Advancement of Science, Proceedings, volume 26, 

 1878, pages 286-291. 



Richthofen's theory of the loess in the light of the deposits of the Missouri. 

 American Association for the Advancement of Science, Proceedings, vol- 

 ume 27, 187-9, pages 231-239, 



Has Lake Winnipeg discharged through the Minnesota within the last 200 

 years? American Journal of Science, third series, volume 17, 1879, page 

 120. 



Quaternary deposits of western Iowa and eastern Nebraska. Washington 

 Philosophical Society, Bulletin, volume 4, 1881, pages 120-121. 



Intermittent wells in Nebraska. American Naturalist, volume 17, 1883, pages 

 533-534. 



- Publications relating to geology. 



