the mouth of Alatna R.; July 26 Helpmejack Creek above Beaver City; Aug. 3 between Kowak R. and Helpmejack Creek; Aug. 14 20 miles below Walker Lake; Aug. 20 Valley of Kobuk R.; Aug. 30 Kobuk R. below mouth of Squirrel R.  In 1902 POTO together with SCHRADER did geological research work at upper Copper R.  He collected about 175 specimens, now in Nat. Herb., Washinglon.  The route is not clear, as three different parties conducted the work independently, but the following places were visited by POTO: June 4 Mt Drum trail; July 6 Kotzina R.; July 9 Long Glacier; July 10 Chesin R.; Aug. 22 Eagle Creek, west fork.    A report of the expedition is found in U. S. Geol. Surv., Twentyfourth Ann. Rep. p. 79-93.
        1901.   Mendenhall, W. C., geologist of the U. S. Geol. Surv., was a member of the same surveying party as POTO in 1901.  On the labels of the specimens collected MENDENHALL is given as collector, but in the printed report POTO is said to have collected the plants.
        1902.    Brooks, Alfred Hulse, and Prindle, Louis Markus, both of the U. S. Geol. Surv., made a geological expedition from Cook Inlet to Rampart and collected about 170 specimens, now in Nat. Herb., Washington.  Most of the specimens seem to have been gathered by PRINDLE.  Schott, L., apparently belonging to this party, collected a few specimens.   The following places were visited: June 1-2 Tyonek; June 6 Mt Sushitna; June 10 Beluga R. valley; Skwentna R.; July 5 Kichatna R. valley; July 7-9 upper Kichatna R.; Rainy Pass; July 10 Simpson Pass; July 13 Happy R.; July 16 Tatina R.; July 23 30 miles N. of Kuskokwim; Aug. 28 Tanana Flats E. of Cantwell; Aug. 29 Tartella; Sept. 4 Tarbona valley; Sept. 13 Lake Country N. of Tanana; Sept. 15 Rampart.
        1902.   Brooks, H. E., obtained a small collection. now in Gray Herb., at St. Michael and along Yukon R.
        1902.   Greely, Adolphus Washington, collected a few specimens, now in Nat. Herb., Washington, chiefly at Columbia Glacier.
        1902.   Newcomb, Charles Frederick, while engaged in ethnographical studies collected about 200 specimens on Prince of Wales I.  Specimens in Field Mus.  The following places were visited: Kazan, Kazan Mt, Karta Lake, Nichols Bay. Copper Mt, all on Prince of Wales I.
        1902.   Macoun, John, botanist of the Geol. Surv. of Canada, obtained a large collection of plants, now in Ottawa, in the Yukon valley.  These collections are enumerated in his »Catalogue of Canadian Plants», which enulnerates all species at that time known from