"If the Night-blooming Cereus," says Mr. Falconer "(see p. 279), ' flowers to a day, at the same date in many greenhouses,' what is the Cereus referred to? In greenhouses Cereus grandiflorus is commonly called the Night-blooming Cereus; in window gardens Phyllocactus latifrons is the plant usually meant; and we all know that other Cereuses common in cultivation - for instance, MacDonaldiae and triangularis - are as truly night-blooming as either of the above. I have grown all of the above sorts, and many more, side by side, for years together, and I can assure you all did not blossom at the same time; not even the several plants of the same species. They blossomed, as a rule, from April till August, but most abundantly in May and June; ccerulescens in April, grandiflorus and MacDonaldias in May and June, nycti-caulis in June, and triangularis in July. Indeejd, the condition of the plants, temperature in which they are grown, and their culture, had considerable influence on their blooming period".

[As our correspondent well observes, there are numbers of Cereuses which bloom only at night. But, so far as we know, the only "Night-blooming Cereus" of horticultural literature is Cereus grandiflorus. At any rate, this was the species referred to. - Ed. G. M].