264 PROCEEDINGS OF THE AMERICAN ACADEMY 



G. Ellisii. 



June 12. Sporiflia sown on detached leaves of 



Pyrus arbutifolia, 



Cratcegus tomentosa^ 

 and kept in a moist chamber. 

 June 14. Sporidia sown on 



2 Anielanchier Canadensis. 



2 Cratcegus tomentosa. 



June 20. A manifest effect on the Pyrus leaves which, however, 



moulded without actually producing spermogonia. 

 June 23. Yellow discolorations appeared where sporidia were sown 



on the Amelanchier plants ; otherwise no further result. 



G. CLAVIPES. 



May 11. Sporidia sown on 



3 Cratcegus tomentosa. 

 3 Pyrus malus. 



2 Amelanchier Canadensis. 

 1 Pyrus arbutifolia. 



May 22. Spermogonia appeared on both Amelanchiers, on two fresh 

 shoots, as well as numerous leaves, and also upon a single apple 

 leaf. No result with the remaining plants. 



June 3. Signs of tccidia appeared on the young shoots of Amelan- 

 chier, one of whicli died, while the other, 



June 12, produced Rcestelia aurantiaca in abundance. The leaves 

 affected continued for some time to produce spermogonia, which 

 showed a tendency to run along the veins and midrib. 



G. CONICUM. 



May 4. Sporidia sown on 



1 Amelanchier Canadensis. 

 1 Pyrus arbutifolia. 



3 Pyrus Americana. 



4 Pwus malus. 



May 10-11. Spermogonia appeared on the Amelanchier and on one 



apple. 

 May 22. Signs of sccidia on most of the Amelanchier leaves, and. 

 May 31, a Rcestelia, apparently R. cornuta, was fairly well devel- 

 oped. No results with the remaining plants. 



