192 



REPORT OF NATIONAL MUSEUM, 1919. 



Gibson, Edmund H. — Contiuuecl. 



Gives a key to the species of 

 Dolichocysta, describes D. magna, 

 D. densata, and Corythaica cos- 

 tata and gives notes on otlier of 

 the included species. 



and Abbt Holdeidge. Notes 



on the North and Central American 

 species of Acanthocephala Lap. 



Can. Ent., vol. 59, no. 7, 

 July 10, 1918, pp. 237- 

 241. 

 Gives a key to and notes on the 

 included species. 



GiDLEY, James Williams. Significance 

 of divergence of the first digit in the 

 primitive mammalian foot. 



Journ. Washington Acad. 

 Sci., vol. 9, no. 10, May 

 19, 1919, pp. 273-280. 

 Reviews briefly the various 

 views regarding the arboreal 

 ancestry of marsupials, especially 

 those of Matthew to the effect that 

 all mammals passed through an 

 arboreal stage of development. 

 Mr. Gidley disagrees with Mat- 

 thew's view, and attempts to show 

 first that opposability of the first 

 digit, wherever found, is not prim- 

 itive but a specialization for a 

 peculiar adaptation, and second, 

 that simple divergence of the first 

 digit does not in itself signify 

 opposability, but is essentially a 

 primitive character inherited from 

 the generalized, terrestrial reptil- 

 ian foot. He concludes that the 

 generalized type of foot with the 

 first digit divergent, but not op- 

 posable, is the primitive stage from 

 which developed directly the 

 various terrestrial types of feet 

 found among living mammals as 

 well as the arboreal and aquatic 

 types, but that the terrestrial 

 types did not pass through the 

 arboreal stage. 



(See also under Gerrit S. Mil- 

 ler, jr.) 



Gilbert, Chester G., and Joseph E. 

 PoGUE. Petroleum : A resource in- 

 terpretation. 



Bull. U. 8. Nat. Mus., no. 

 102, pt. 6, Aug. 7, 1918, 

 pp. 1-76, pis. 1-3, figs. 

 1-12. 

 Petroleum is of particular sig- 

 nificance because, of all our im- 

 portant resources, it is most 

 limited and involves the highest 

 percentage of waste. Scarcely 



Gilbert, Chester G., and Joseph E. 



PoGUE — Continued. 



one-tenth of the value of the re- 

 source is recovered under present 

 circumstances, while the unmined 

 supply available under current 

 practice is only about 50 barrels 

 to each person. This paper makes 

 an economic study of the resource 

 and the Industry engaged in its 

 development, and traces the causes 

 of waste to certain maladjustments 

 in the economic situation, pointing 

 out how these may be remedied by 

 a constructive economic policy ap- 

 plied to the matter. The de- 

 sirability of developing shale oil 

 to replace petroleum as it becomes 

 incapable of meeting the demand 

 is gone into and the advisability 

 of using benzol and alcohol as 

 substitutes for gasoline is con- 

 sidered. The natural gas indus- 

 try is also treated. 



Povper : Its significance and 



needs. 



Bull. U. 8, Nat. Mils., no. 



102, pt. 5, Sept. 21, 1918, 



pp. 1-53. 

 In this country tremendous em- 

 phasis is placed on the use of 

 power ; the result is a growing 

 burden on transportation which 

 must be solved. The present trans- 

 portation difliculty is in a measure 

 an expression of this problem. 

 The purpose of this paper is to 

 develop the general nature of the 

 situation and suggest the character 

 of remedial action called for. 



The energy resources of the 



United States: A field for recon- 

 struction. 



Bull. U. S. Nat. Mu8., no. 

 102, vol. 1, May 15, 1919, 

 pp. 1-165, pis. 1-3, figs. 

 1-15. 

 This paper brings together the 

 substance of parts 4, 5, and 6 of 

 Bulletin 102, together with an in- 

 troduction and a conclusion that 

 coordinate the details of the dis- 

 cussion and draw forth the main 

 issues. It is concluded that the 

 whole matter involves the three- 

 fold problem of fuel supply, power 

 supply, and transportation, and 

 that the entire field may be cleared 

 by (1) providing a common-carrier 

 system of electric transmission 

 lines which will (a) lead to a bal- 

 anced development of coal-power 

 and water-power, and (6) serve as 

 a coordinating influence in stim- 



