54 THE BOOK OF THE IRIS 



occur in linear, elongated, striaeform pustules which are 

 blackish to the eye." Presumably the state producing 

 teleutospores is later than the state producing the uredo- 

 spores. This pest is known in France, the Ardennes, 

 Germany, Switzerland, Italy, and Siberia. The Cluster- 

 cup form is unknown. No experience in dealing with 

 this disease appears to be recorded. 



Cluster-CUpS (Aecidiumlridis). This fungus is known 

 in North America, on leaves of Iris versico/or, but is not 

 apparently recorded as a pest for Britain. 



It will be noticed that I have frequently referred to 

 Dr Cooke's article in the Journal of the Royal Horticul- 

 tural Society. It is entitled " Pests of the Flower 

 Garden," and is exceedingly valuable as an account of 

 the parasitic fungi causing disease in gardens. At the 

 end is a valuable account of fungicides. Jeyes' Fluid is 

 recommended for sterilising soil, and meritorious effects 

 are stated for paraffin and potassium permanganate, both 

 of which may be used without risk to the operator. For 

 paraffin the proportion is one wine-glassful to two gallons 

 of water. The present writer has found that the mixture 

 is very easily made with a syringe if the paraffin is first 

 of all saturated with naphthaline. Potassium perman- 

 ganate is obtainable from all chemists in crystal form, 

 and the solution should be of the strength to give a pale 

 rose colour. Sulphate of iron is a useful fungicide, and 

 may be used in the proportion of two pounds of sulphate 

 to five gallons of water. The iron may be valuable as 

 a manure, but it is worth note that too much in the soil 

 is distinctly injurious. 



