I. Introduction. Route near the 47th and 49th parallels.
II. Routes near 38th and 39th, 41st and 32d parallels. Lander's report.
III-IV. Route near the 35th parallel.
V. Routes in California to connect with those near the 35th and 32d parallels.
VI. Routes in Oregon and California.
VII. Route in California to connect with those near the 35th and 32d parallels. Route between the Rio Grande and I'lmas villages.
Mammals of the several routes.
Birds of the several routes.
X. Reptiles and fishes of the several routes ; zoological reports on routes near 38th and 39th, 41st, 35th, and 32d parallels ; on routes in California to connect with those near 35th and 32d parallels ; reptiles of routes in California and Oregon.
XI. Material used and methods employed in compiling the general map. Topographical maps, etc.