424 Canadian Record of Science 



LITERATURE CITED. 



1. Fritsch — "The Subaerial and Fresh-water Algal 



Flora of the Tropics ' ' — Annals of Botany XXI., 

 1907. 



2. Benecke — "Uber die ursachen der Periodiztat im- 



Auftreten der Algen, auf Grand von Versuchen 

 iiber die Bedingungen der Zygotenbildung bei 

 Spirogyra communis." 1908. 



3 Danforth — "Periodicity in Spirogyra" — Report of 

 Missouri Botanical Garden. " 1910. 



4. Copeland — "Periodicity in Spirogyra" — Bot. Gaz. 



47, 1909. 



5. Derick, C. M— "The Holdfasts of the Florideae" 



— Bot. Gaz. 34, 1896. 



6. Fritsch and Rich — "Observations on Spirogyra" — 



— Annals of Botany XXI, 1907. 



7. Collins, F. S. — "Green Algae of North America," 



1909. 



8. Klugh, A. B.— "The Algae of the Bruce Penin- 



sula"— Ottawa Naturalist, Vol. XXV, No. 6," 

 1911. 



9. West, C. S.— "The British Fresh- water Algae," 



1905. 



10. Adams and Leroy — "The Artesian and other deep 



wells of the Island of Montreal." 



11. Thompson, C. H. — "Dissemination of Lemna." 



12. Nieuland, J. H.— "Mounting of Algae"— Bot. 



Gaz." 1909. 



