OP ARTS AND SCIENCES. 313 



June 8. The spermogonia on leaves named still visible, but the 

 leaves had become so mouldy that there was no hope of the devel- 

 opment of cecidia, and the cultures were abandoned. 



II. Gyji. macropus. 



May 18. Sporidia sown on 



5 seedlings of apple. 



4 leaves of apple. 



3 leaves of Amekmchier Canadensis. 



3 leaves of Cratcegics oxyacantha. 



May 28, Soon after the sowing, the leaves of apple seedlings be- 

 came mottled, but no spermogonia were plainly seen until the 

 28th, when they appeared on all the five seedlings. 



June 8. Culture abandoned, as the leaves were all mouldy. 



III. Gyh, clavipes. 



May 18. Sporidia sown on 



5 seedlings of apple. 



4 leaves of apple. 



4 leaves of Amelanchier Canadensis. 

 3 leaves of Cratcegus oxyacantha. 



May 23. Spermogonia appeared on one leaf of Amelanchier » 



May 24. Spermogonia appeared on one seedling apple. 



May 26. Spermogonia on two more apple seedlings. 



May 28. Spermogonia on two more leaves of Amelanchier. 



June 10. Leaves mouldy and culture abandoned. 



IV. Gym. biseptatum. 

 May 19. Sporidia sown on 



5 seedlings of apple. 



3 leaves of apple. 



4 leaves oi Amelanchier Canadensis. 

 3 leaves of Cratceyus oxycantha. 



May 28. Spermogonia appeared on three Amelanchier leaves. 

 June 5. Leaves mouldy and culture abandoned. 



v. Gym. Ellisii. 



May 23. Sporidia sown on two seedlings of apple. 



May 29. As the previous sowing produced no result, owing possibly 

 to the sporidia not being sufficiently abundant, five seedlings of 

 apple, iucluding the two mentioned above, were sown with fresh 

 material. No result. 



