Tilden: bibliography of American algae. 378 



972. Nichols, W. R. Chemical Examinations of water from 

 the Nashua River Basin. C. F, Folsom's "Pollution of 

 Streams." 8th Ann. Rep. Mass. St. Bd. Health. 48-51. 1877. 



Leptothrix found. 



973. . Water Supply considered mainly from a 



Chemical and Sanitary Standpoint. J. Wiley & Sons, 1883. 

 New York. 



. See Farlow, W. G., Nichols, W. R. and 



Burgess, E. S. 



974. Nicholson, T. On the Red Snow of the Arctic Regions. 

 Mag. Nat. Hist. 2:321-323. 1829. 



975. Nordstedt, C. F. 0. Fam. Desmidiaceae in Eug. Warm- 

 ing Symbolae ad Floram Brasiliae centralis cognoscendam. 

 Part 5. Vid. Medd. 1 : 195-234. 1870. 



976. . Desmidieae arctoae. Oefvers. Kongl. Vet. 



Akad. Foerhandl. 32:13-43. 1875.— (Hedwigia. 15:12-15.19- 

 25. 1876.) 



977. . NonnuUae algae aquae dulcis brasilienses. 



Oefvers. Kongl. Vet. Akad. Foerhandl 34:15-28. 1877.— 

 (Hedwigia. 17:77-79. 84-88. 1878.)— (Am. Jour. Sci. Arts. 

 m. 15:225, 226. Mrl878.) 



978. . De Algis et Characeis. I. De Algis nonnullis 



praecipue Desmidieis, inter Utricularias Musei Lugdun-Batav. 

 Act. Univ. Lund. 16:1-14. ipZ. 15N1880. 



979. . Algas de la republica Argentina. Bol. Acad. 



Nacion Cienc. Repub. Argent. 4:1882. Buenos Ay res. 



980. . Algologiska Smasaker HI. Bot. Notiser. 46- 



51. 1882.— (Bot. Centralb. 11:81. 1882)— (Bot. Jahresb. 

 10:304,305. 1884.) 



Algae from Argentine and Patagonia. 



981. . Physiographische gesellschaft zu Lund. 



(Zeichnungen von 2 neuen abweichenden arten der gattung Bul- 

 bochaete vor.)— (Bot. Centralb. 16:95. 1883.) 



One species collected in Brazil. 



982. . Desmidieer samlade af Sv. Berggren under 



Nordenskioeld 'ska expeditionen till Groenland 1870. (Die. 

 von Sv. Berggren auf der Nordenskioeld 'schen Expedition 

 nach Groenland 1870 gesammelten Desmidieen.) Oefvers. Kongl. 

 Vet. Akad. Foerhandl. 5-13. p^. 7. 1885. 



983. . De Algis et Characeis. Acta Univ. Lund. 



Lunds. Univ. Ars-Skrift. 25:1-41. pi. 1. 1888. 



Two new desmids from Brazil and other algae from North and South 

 America. 



