The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . Parnassia timbriata. Small August 27, 3,000 A. T. Parnassia palustris, L August 6. Epilobium latifolium, L August 6, 1,600 A. T. Epilobium origanifolium Lam. (?) August 28. Solidago raultiradiata. Ait August 27. Erigeron salsuginosus. Gray, arctic August 27, 3,000 A. T. Antennaria margaritacea, arctic form August 27. Achillea millefolium, L., arct
The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . Parnassia timbriata. Small August 27, 3,000 A. T. Parnassia palustris, L August 6. Epilobium latifolium, L August 6, 1,600 A. T. Epilobium origanifolium Lam. (?) August 28. Solidago raultiradiata. Ait August 27. Erigeron salsuginosus. Gray, arctic August 27, 3,000 A. T. Antennaria margaritacea, arctic form August 27. Achillea millefolium, L., arctic variety,,.. August 27. Arnica obtusifolia, Les August 27, 1,200 A. T, Campanula rotundifolia, var. Alaskana. August 28. Gentiana platypetala (?) August 27. Gentiana Menziesii (?) August 27. Mertensia maritima August 7. Castilleja parviflora, Brong. August 28, Salix vestita, Pursh August 6. Ilabenaria liyperborea, R, Br August 27, 2,650 A. T. Luzula parvitlora, Meyer. Poa alpina, variety vivipara August 26, 1,500 A. T. Poa alpina, August 26, 1,600 A. T. Poa laxa, 1 l»nke. August 26, 1,500 A. T, 70 THE ICE AGE IN NORTH AMERICA, Phleura alpinuin. I August 26, 1,600 A. T. Elyiuus mollis August 6. Hordeum, sp. (?) August Pis. 30.—Blocks of stone snpported on ice-pillare, showing how they fall toward the above, page 49. United States Geological Survey (Russell). A MONTH WITH THE MUIR GLACIER. 71 SUPPLEMENT TO CHAPTER III. For various reasons it is best to let this chapter stand asit Avas originally written. But it is necessary to append asummary of the results of subsequent observations by others,especially as they have a most important bearing on severalquestions of glacial theory. During the summers of 1890and 1892 Professor Harry Fielding Reid with a corps ofcompetent assistants carefully surveyed the region and madeextensive additions to our knowledge, not only of this glacier,but of glacial movements in general. The main facts, as determined by Profess
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