MEMORIAL OF R. H. LOUGHRIDGE 51 



reports on the States of Georgia, Texas, Arkansas, Indian Territory, and 

 Missouri, which necessitated a good deal of field-work in the way of geo- 

 logical examination in all these States. 



In the coordination of the State reports, and especially in the adjust- 

 ment of the general map with the individual State maps, and of the State 

 maps with each other, Loughridge was Doctor Hilgard's main dependence, 

 since he had had personal acquaintance with the geological and agricul- 

 tural boundaries in most of these States. The soil analyses also, on which 

 Doctor Hilgard laid much stress, were made in the summer and fall of 

 1880, mainly in the chemical laboratory of the University of Alabama, 

 under the joint direction of Mr. Loughridge and myself, he having over- 

 sight of the laboratory during the summer months, which I devoted to 

 field-work in Alabama and Florida, while I had charge of the chemical 

 work the rest of the time, thus liberating Loughridge for his field-work 

 in the different States. In this way most of the chemical analyses of 

 soils of the cotton-producing States, with exceptions below noted, were 

 made. A great number of analyses of Mississippi soils were already avail- 

 able through the work of Doctor Hilgard prior to 1860, and by myself and 

 Loughridge from 1868 to 1874, but it was necessary to supplement these by 

 analyses of soils specially selected by Doctor Hilgard to illustrate certain 

 types which came under discussion. In a similar way, while most of the 

 analyses of soils from the other cotton-producing States were made at 

 the University of Alabama under conditions above described, yet it was 

 found necessary to supplement these by analyses of specially selected soils, 

 and these analyses were carried out by Loughridge at the University of 

 California, whither he was called by Doctor Hilgard to assist in the final 

 arrangement of his great report. 



The importance of the assistance rendered by Loughridge to Doctor 

 Hilgard in the preparation of these Cotton Culture reports, can not well 

 be overestimated ; for, in addition to writing the reports of the five States 

 above named, he conducted a large proportion of the correspondence of 

 Doctor Hilgard with the special agents in charge of the several States, 

 necessary for the proper correlation of the individual State reports and 

 their adjustment as parts of a consistent story of cotton culture in the 

 United States. Besides the analyses of selected soil types, he made many 

 special humus determinations for this report. In a word, there was 

 no one else who could have carried out the investigations needed by Doc- 

 tor Hilgard to make his report the complete monograph which he had 

 planned. 



After all the manuscripts of the Cotton Culture reports were in the 

 hands of the printers Doctor Loughridge accepted a position with the 



V— Bull. Geol. Soc. Am., Vol. 29, 1917 



