;U2 THK RU8T.S t»l NOVA SCOTIA. — I'KASKH. 



Tho descriptions that follow are based on tlic collections 

 of Nova Scotia material. Tt was necessary when certain forms 

 wei'e not collected or when the collections were scanty to make 

 use of the systematic literature cited at the end of this paper. 

 These oases are recorded in the notes that follow the descrip- 

 tion, of the species. 



An interesting feature of the work was (he field situdy 

 with the object of connecting aecial and t^lial stages and the 

 culture experiments undertaken to t.est the clues thus obtained. 

 As a result the life histories of a number of species previously 

 unknown were worked out. These arc noted undev the 

 descriptions of the species. 



A .''>0'f solution of lactic acid was used for the pur|>ose of 

 clearing the sections and swelling the spores to their normal 

 shape and size. This is necessary in the case of the spores of 

 the Puccinia Hieracii type, as the dried spores are much con- 

 tracted and wrinkled. The spores or sections were ])laced on 

 a slide and a drop of the lactic acid solution added. The slide 

 Avas then heated over a spirit lamp and the liquid was brought' 

 to the boiling point or allowed to l>oil for a few &c(tonds. 

 This also brought out the germ pores more clearly. 



The drawings are made with the aid of a camera lucida 

 to a uniform magnification of 480 diameters, except in a few 

 ca.scH not<'d in the d('SM'i])tion,-^ accompanying the drawings 

 which are reduced lo unedialf rlie diameters in the photo- 

 gravure |»roccssi. 



Grab's "New Manual of llotany" was used in delei'mining 

 the host plants. 



The writer is (lec[)ly indebted lo Dr. .1. ( '. Arthur for 

 valuaible suggestions and for the determination of doubtful 

 species. He is also indebted to John Maooun, Naturalist, 

 Geol. Survey Dept. of Canada, for the ]irompt determination 

 of a few doubtful host ]ilants. 



