16 THE ORCHID REVIEW. 
have been damped, as it would be foolish to pour down the liquid and then 
wash it away, or dilute it by adding water to it. Care must also be taken 
to close all the ventilators to prevent the escape of the vapour. 
It may perhaps be useful if I now give the proportionate quantities of 
the ingredients which produce the amoniacal liquid, and: the method of 
preparing it. Eighteen gallons of water are placed in a tub, and to this 
quantity of water is added three gallons of soot and one gallon of fallen 
lime, and the mixture is then well stirred up and allowed to stand, covered 
with a cloth, until it is required for use, which is usually in about three or 
four days’ time. When used the mixture is well stirred up, and no attempt 
is made to use the clear liquid only. 
Before closing this letter I will give one instance, among very many, 
which proves the almost immediate effect of the ammoniacal vapour on the 
colouration ‘of the leaves of Orchids. About September 30th of the present 
year I purchased a plant of Cypripedium Rothschildianum giganteum, and 
added it to my collection. When it arrived its leaves were of an unhealthy 
yellow colour, and the plant looked weakly and out of health, but after 
only eight weeks’ treatment a most remarkable change has taken place, for 
the yellow colour has gradually disappeared, and its leaves have become a 
beautiful and healthy green, which colour will gradually grow darker and 
darker until it approaches the normal tint which a really healthy Orchid 
ought to have. In conclusion, I may explain that I now grow Cypripedes 
alone, but I have found this ammoniacal treatment just as efficacious with 
the other sections of the Orchid family. 
Bridge Hall, O. O. WRIGLEY. 
mary. 2) 
CALANTHE x HARRISII. 
WE have received the eight-flowered inflorescence of the beautiful white 
Calanthe xX Harrisii from the collection of J. T. Bennett-Poé, Esq., 
Holmewood, Cheshunt, to which a First-class Certificate was given by the 
Royal Horticultural Society, on December 14th last. It is a hybrid raised, 
we believe, by the late Dr. Harris, of Lamberhurst, Kent, from C. vestita 
Turneri ? and C. X Veitchii ¢, and thus may be considered as a white 
variety of C. X Sedenii. In shape it is fairly intermediate between the two 
parents, but the colour is white, with a faint trace of light yellow in the 
throat. It is a very beautiful thing, and the raceme has evidently not yet 
_ nearly reached its maximum development. Messrs. James Veitch and Sons 
have also one of the plants, which received an Award of Merit at the 
R. H. S. meeting on December roth, 1895. 
