260 



Rusby, Henry Hiird. A floating 

 orchid {Eahenaria repens). New York, 

 N.Y., J. Bot. Gard., 7, 1906, (112-115, 

 incl. pi.). [6000]. 34081 



Observations in economic 



botany made at Oscoda, Michigan. New 

 York, N.Y., J. Bot. Gard., 7, 1906, (211- 

 213). [8000 ggl 34082 



The wild grains and nuts 



of the United States. [Abstract of a 

 lecture delivered at the New York 

 Botanical Gardens, November 24, 1906.] 

 New York, N.Y., J. Bot. Gard., 7, 1906, 

 (269-273). [0040]. 34083 



— The home of Dudleya 



liusbyi. Torreya, New York, N.Y., 6, 

 1906, (50-51). [5400 8000 gi]. 



34084 



A historical sketch of the 



development of botany in New York city. 

 [Address delivered "before the Torrey 

 botanical club at a special meeting held 

 on May 23, 1906.] Torreya, New York, 

 N.Y., 6, 1906, (101-111, 133-145). 

 [0040]. 34085 



Ruska, J. Kernlose Birnen. Natw. 

 Wochenschr. Jena, 21, 1906, (126). 

 [5400 1560 1800]. 34086 



Russ, Viktor K. Einiges liber den 

 Einfluss der Rontgenstrahlen auf Mik- 

 roorganismen. Arch. Hyg., Miinchen, 

 56, 1906, (341-360). [7700]. 34087 



Russell, William James. The action 

 of plants on a iihotographic jjlate in the 

 dark. London, Proc. R. Soc, B. 78, 

 1906, (.385-390, pi. 19-21). [3120]. 



34088 



Rustung, G allow. ludeholder linfr0 

 stivelse ? [Enthiilt Semen Lini Starke ?] 

 Pharmacia, Kristiania, 3, 1906, (325- 

 328). [3120 5400]. 34089 



Ruthven, A. G. An ecological survey 

 in the Porcupine mountains and Isle 

 Royale, Michigan. [With bibliography.] 

 Michigan, Rep. Geol. Surv., Lansing, 

 1905, 1906, (17-55, with text fig.). 

 [8000 gg]. 34090 



Notes on the plants of the 



Porcupine mountains and Isle Royale, 

 Michigan. Michigan, Rep. (ieol. Surv., 

 Lansing, 1905, 1906, (75-92). [SOOOgg]. 



34091 



Ru^idka, Stan. Eine eiufache Me- 

 tbode zur Herstellung sauerstoft'freier 

 Luftatmosphare (als Methode zui ein- 

 fachen, verlasslichen Ziichtung von 

 strengen Aii.'icroben). Arch. Hyg., 



Miinchen, 58. 1906, (327-344). [7700 

 0090]. 34092 



Ryan, T. Cordyline Banksii. Gard. 

 Cki-on., London, (Ser. 3), 40, 1906, (240, 

 fig. 100). [6000]. 34093 



Cordijl'ine hidlvisa vera. 



Gard. Chron., London, (Ser. 3), 40, 1906, 

 (245, Suppl. Illust.) [6000]. 34094 



Rydberg, P[er] A[xel]. Flora of 

 Colorado. Agric. Exp. Sta., Colorado, 

 Fort Collins, Bull., No. 100, 1906, 

 (xxii + 448). 22 cm. [8000 yi]- 34095 



■ Peuthoraceae: N. Amer- 



Flora. New York, N.Y., 22. 1905, 



(75). [5400]. 34096 



Parnassiaceae. N. Amer. 



Flora, New York, N.Y., 22, 1905, (77- 

 80). [5400]. 34097 



Studies on the Rocky 



mountain flora-16. New York, N.Y., 

 Bull. Torrey Bot. CI., 33, 1906, (137- 

 161). [8000 i/i 5400]. 34098 



Explorations in Utah. 



New York, N.Y., J. Bot. Gard., 6. 1905, 

 (158-165). [8000 gi]. 34099 



Grayta or Eremosemium. 



Torreya, New York, N.Y., 6, 1906, (8- 

 10). '[5400]. 34100 



— ' Boi^sfihin or It'nbacei'. 



Torreya, New York, N.Y., 6. 1906, 

 (165-169). [0070]. 34101 



■ V. Small, John Kunkel. 



[Rytov, S. M.] Phtobt., 0. ]\L Hi- 

 KOTopuH oSiuia rpaHHn;bi paciipe,Tfe- 

 aenia aBnoopa^iHusTj pacTeHiii EBpo- 

 neiiCKoii Pocciii. [Einige gemeinsame 

 Verbreitungs-Grenzeu der phanerogamen 

 Pflanzeu des europiiischen Russlands.] 

 Moskva, Trd. Kruz. izsl. russ. prir., 2. 

 1905, (13-49, mit 1 Karte). [8000 dh]. 



34102 



Rytz, Walter. Beitrage zur Kenntuis 

 der Gattung Synchytrium. (Vorl. Mit- 

 teilung. ) Centralbl. Bakt., Jena, Abt. 

 2, 16, 1906, (511-512). [7700 4050]. 



34103 



[Saakov. A.] CaaKOBi., A. Capan- 

 HCBaa oopboa bi> TypKecTaHCKOMi> 

 Kpa'fe II oy^ymaa ea opraHii3aii,ia. 

 [Die Bekampfung der Wanderheu- 

 schrecken im russischen Turkestan und 

 ihre zukiinftige Organisation.] Kav- 

 kazsk. selisk. choz., Tiflis, 12, 1905, 

 (.363-365, 380 382, 401-403, 413-415). 

 [43.50 4100]. 34104 



