290 THE FLORIST AND 



It was found growing at an altitude of 12,000 ft. above the level of the 

 sea, on the Peruvian Andes, by Mr. M. W. Lobb, collector for Messrs. 

 Veitch of Exeter, England. Dr. Lindley described the plant as a new spe- 

 cies under the name of Ceratostema longiflorum : but when it was exhibited 

 in flower at Chiswick in the summer of 1853, it was found to be identical 

 with the C. grandiflorum of the Elora of Peru. 



"It forms" says Dr. Planchon, in the Flore des Serres, " a rather small 

 bush, flowering when less than a foot high, having numerous branchlets, stiff 

 and straight, with dense persistent coriaceous foliage of a handsome green, and 

 magnificent tubular campanulate flowers, gracefully pendant, with a scarlet 

 corolla more or less shaded with orange, of a semi-coriaceous, waxy consis- 

 tence. Altogether it is an admirable acquisition for the green-house or con- 

 servatory, and perhaps, in certain parts of Europe, for the open air." It 

 will therefore probably prove hardy in this country south of Virginia. It 

 has not yet, we believe, been introduced to this country. 



MILDEW IN GRAPERIES. 



BY PROFESSOR S. S. HALDEMAN, A. M. 



It is well known that Mildew and similar vegetation arises from a super- 

 abundance of moisture, and the absence of light, of which the latter is the 

 least important in the consideration of the subject. The presence of too 

 much moisture, independently of the fact that it facilitates the growth of 

 parasitic vegetation, is injurious to many plants, by retarding the evapora- 

 tion which their economy requires. The presence of Mildew may cause the 

 fruit to drop prematurely, as it constitutes a disease which penetrates to the 

 inner parts of the fruit. 



As much of the moisture in a green-house comes from the plants them- 

 selves, it is evident that ventilation is of great advantage, and it is accord- 

 ingly, freely resorted to. Ventilation is, however, of little use in checking 

 the growth of Mildew, when the external atmosphere is as damp as that 

 within the grapery for a week or two at a time. 



In looking for a remedy, we must be acquainted with the circumstances 

 upon which the deposition of moisture depends. In a succession of warm 

 days, the air takes in solution, as much water as it can hold at a given tem- 

 perature, and if the temperature is increased, it is able to dissolve a farther 

 portion. If, on the other hand the saturated air should be cooled, the water 

 it holds in solution must be given up, when it appears as a fog, a dew or a 

 rain. The highest point of temperature at which dew will form on the out- 



