492 Rei'out of the My(;ologist of the 



containiii}:; livo jrrams of buriiiii<j: sulidiur ^vas placed undor tbe 

 bell-jar and left undisturbed for one hour. At the end of the 

 hour the carnation leaf was removed and four cultures made 

 from one of the rust-sori. l^efore the leaf had been fumigated 

 a check culture had been made from the same sorus from which 

 the four cultures were afterward made. At the end of seventeen 

 hours these four cultures and the check culture were examined 

 under the microscope. The check culture was germinating freely 

 but there were no signs of germination in any of the other four 

 cultures. This showed that the sulphur fumigation had killed 

 the rust spores. 



During the process of fumigation the spores changed color, 

 noticeably, from brown to light yellow. 



The practice of fumigating greenhouses before bringing in the 

 plants is undoubtedly a good one. If the work is thoroughly 

 done spores of many kinds of fungi and also many insects will 

 probably be killed; but I do not believe that- the painting of 

 steam-pipes with sulphur does any good — the fumes are not suffi- 

 ciently strong. 



Rust-Resistant Varieties. 



It is an undeniable fact that some varieties of carnation are 

 much less susceptible to the attacks of rust than are others, and 

 this difference is sufficiently great to be of practical importance. 

 Whether there is any variety absolutely rust-proof or not is un- 

 certain. From observations which I have made in greenhouses in 

 the vicinity of New York, I learn that the variety Wm. Scott is 

 almost rust-proof. I have repeatedly seen it growing in the same 

 house with other varieties which were rusting badly and not a 

 trace of rust could be found on Wm. Scott. I have sought long 

 and carefully for rust on Wm. Scott but have never been able to 

 find it except in one case, viz.: in the greenhouse of Mr. Lee at 

 Riverhead, N. Y., where it was not at all difficult to find speci- 

 mens. In November, 1895, 1 published a note in the American 

 Florist and also in Lhe Florists' Exehanye requesting those who 

 have seen rust ctn Wm. Scott to couniiunicate with me. Four 



