364 THE ORCHID REVIEW. 
splendid flower of P. Charlesworthii giganteum is sent from the collection 
of Major-General Gillespie, of Brynderwen, Usk, in which the dorsal sepal 
is slightly over three inches in diameter, and very beautifully coloured. 
Two fine forms of P.insigne are sent from the collection of O. O. Wrigley, 
Esq., Bridge Hall, Bury. ‘ Harefield Hall var,” is an extremely fine thing, 
having the dorsal sepal nearly 23 inches across, and the blotches rather 
large. ‘‘Upland’s var.” is remarkably similar and only very slightly 
smaller. 
YELLOW CATTLEYAS: A HINT TO HYBRIDISTS. 
InN a recent issue of Revue Horticole, Mr. C. H. Maron, a well-known 
Orchidophile, makes some suggestive observations with regard to the 
production of the yellow colour in new hybrid Cattleyas. Up to the 
present time, the facts would point to the conclusion that Lelia flava has 
not been much used with this object in view, reliance being placed on 
C. Dowiana aurea, the colour of which, however, is by no means a true 
yellow ; and in all the hybrids of which it has been the base, the yellow 
colour of the segments has given place to a colour of more or less decided 
rose. The colour of C. D. aurea is a mixture of gamboge and rose cerise ; 
that of L. flava is a positively pure yellow. The writer proceeds to 
illustrate his point by a reference to the success attained by fertilizing 
C. Percivaliana with L. flava, when he obtained the very distinctly yellow 
Lelio-cattleya x Ernesti.—-Oakes Ames in American Gardening, Nov. 11, 
p- 766. 
CALENDAR OF OPERATIONS FOR DECEMBER. 
By H. A. BURBERRY, Orchid Specialist, King’s Heath, Birmingham. 
Let the following figures be the guide for the temperatures during the 
present month. 
CooL HOUSE.—Day, 55° ; night, 50°; morning, 45°. It may go as low 
as 40,° and as high as 60°, but.for short periods only. 
INTERMEDIATE HOUSE.—Day, 55° to 60°; night, 50% to 55°; morning, 
45° to 50°. Do not let it go below 45° if possible, but it may rise as high 
as 65° during warm or sunny days. 
East INDIAN House.—Day, 60° to 65°; night, 55° to 60°; morning, 
55° to 65°; a few degrees fluctuation being allowed either way according 
to the conditions outside. ‘ 
Particular attention should be paid to the atmospheric conditions 
during this dull, dark month. If the weather should be mild, very little 
warmth from the fire will be needed to maintain the requisite degrees, and 
