POT-PLANTS IN GREENHOUSES AND FRAMES 25 



the water just tinged, or with a solution of fresh sulphide 

 of potassium (liver of sulphur) at the rate of h oz. to the gallon. 

 As the latter solution blackens paint, it cannot well be used 

 in a greenhouse. Flowers of sulphur dusted over the foliage, 



Fig. 10. — Parasitic fungus growing through one of the 

 stomata in a leaf (greatly enlarged). 



when damp, may be substituted for it when the disease is 

 mildew. 



But diseases and insects rarely attack plants when they 

 are growing satisfactorily. The chief thing is to keep the 

 latter in a healthy condition by attention to their cultural 

 requirements as regards cleanliness, food, water, temperature, 



