New York Agriculttjrat. Experimejnt Station. 491 



moved from under the bell-jar the plants were set in the garden. 

 As late as July 1 (8 weeks from date of inoculation), no trace of 

 rust could be found on the inoculated plants. The attempt at 

 inoculation failed. 



Such tests as these, however, are not sufficient to decide the 

 matter. The proper test is to place healthy plants of a suscepti- 

 ble variety among rusty plants of the same variety. This kind 

 of a test was made. On Nov. 6 live healthy plants of Uncle 

 John, received from Dorner & Son, were set in a bench of very 

 rusty Uncle John in the greenhouse of Mr. F. A. Storm. On 

 Dec. 6 Mr. Storm, who had examined the plants daily, notified 

 me that one plant showed a rust pustule first on Dec. 3. On Dec. 

 9 I examined the plants myself and found one undoubted rust 

 pustule on each of two plants. The other three plants showed 

 no rust. A few days later, and before any further observations 

 were made, Mr. Storm destroyed the whole bench of Uncle John, 

 which were so rustv as to be worthless, and replaced them with 

 Easter lilies. The experiment was, therefore, unavoidably 

 brought to a close before completed but not, however, before it 

 was demonstrated that two of the plants had contracted the dis- 

 ease. There is no possibility that the plants were previously in- 

 fected and hence it is proven that carnation rust will spread 

 among mature pl'iutx. Tlio time elapsing between the date of 

 inoculation and the appearance of the first rust-sorus was twen- 

 ty-eight days. 



An Experiment with Sulphur Fumigation. 



It is frequently recommended to fumigate greenhouses with 

 sulphur in the fall before bringing in the plants. Painting the 

 steam-pipes with a mixture of sulphur and lime is also recom- 

 mended. The latter is done after the plants are brought in. 



Wishing to know more definitely the effect which sulphur 

 fumigation has on rust spores I made the following experiment: 



A rusted carnation leaf was placed under a tall bell-jar having 

 a capacity of twenty quarts. The bell-jar stood on a paper on the 

 table, the edges of the bell-jar fitting closely all around. A dish 



