IOWA ACADEMY OF SCIENCES. 



167 



practically certain that all of the Rcestelia found in connection 

 with these experiments was the Rcestelia of G. macropus. 

 Careful search was made in Mr. Hicks' nursery and in orchards 

 at Floral paik and Queens, Long Island, but no Roestelia on 

 cultivated apple was found anywhere on Long Island during 

 the season of 1895, except at Flushing, where a few specimens 

 were taken by Mr. F. A. Sirrine. 



The following table presents, in a condensed form, the 

 results of the experiments on Long Island: 



* All inoculations with N. Y. O. mac7-oims were made May 18. 

 All inoculations with Iowa G. macroims were made May 24. 



The experiments at Ames, Iowa, were conducted at the 

 Agricultural college. May 26, 1895, G. maciX)pus, from New 

 York, was inoculated on Yellow Transparent, Grimes' Golden, 

 Duchess of Oldenburg, Whitney's No. 20 and Pirus coronaria. 

 A large number of leaves on one tree of each were inoculated. 

 In each case, some of the leaves were rubbed on both surfaces 

 with the moistened cedar- apple horns, while others were inocu- 

 lated by making punctures with a sterilized scalpel. On the 

 same day, other trees of the same varieties were inoculated in 

 the same manner with G. macropus collected in Iowa. All of 

 the inoculations, except those on Pirus coronaria, failed. But 

 the Pirus coronaria trees were so completely covered with Roes- 

 telia that scarcely a single perfect leaf could be found. "What 

 part of this was due to artificial inoculation and what part to 

 natural inoculation it is impossible to say. It simply shows 

 that the season was a favorable one for Roestelia. 



Our experiments at Ames are entirely in accord with those 

 made by Doctor Halsted and Professor Pammel. Taken in 



