DECEMBER, 1913.| THE ORCHID REVIEW. 381 
as, besides the countless number of Cypripediums from which selection can 
be made, there are many winter-flowering hybrid Odontoglossums now in 
commerce, together with the beautiful yellow Oncidiums and scarlet 
Odontiodas. Several useful winter-flowering Orchids are to be found in the 
genus Zygopetalum, and Z. crnitum, Mackayi, Perrenoudii, and Gottianum 
will now be throwing up their spikes of showy and long-lasting blossoms. 
These Orchids are vigorous growers, and when developing their spikes are 
greatly assisted by weak doses of liquid cow-manure every three or four 
days. They will also need a good supply of water until the blooms fade, 
when they should be kept somewhat drier for several weeks until ready for 
repotting. 
Having this year given cultural directions for an amateur’s Cool house, 
I propose during the following season to describe the monthly work 
necessary for the Cattleya house. 
SUGGESTED ADDITION. 
ZyYGocoLax CHARLESWORTHII.—This pretty bigeneric hybrid can be 
procured at a reasonable price, and should be included in every Cool house, 
as it is free-flowering and quickly develops into a specimen capable of 
bearing several flower spikes. The blossoms are large, and are freely 
produced during the winter months, and last three to four weeks in 
perfection. The sepals and petals are rich chocolate brown on a white 
ground, the large lip being white with a bright purple blotch covering the. 
greater part. It is a hybrid between Colax jugosus and Zygopetalum 
Perrenoudii, and of fairly recent raising. Two other members of this 
genus are also worthy of inclusion, and bloom about the same period 
namely :— 
Zygocolax Amesianus (C. jugosus X Z. Mackayi). 
Zygocolax Veitchianus (C. jugosus X Z. crinitum). 
REVIEWS OF BOOKS. 
Icones Orchidearum Austro-Africanarum extratropicarum, or figures, with 
descriptions, of extra-tropical South African Orchids. By Harry Bolus, 
F.L.S., Hon. D.Sc. (Cape), Vol. III., William Wesley & Son, 28, Essex 
Street, Strand, London. 
The second volume of this important work appeared in r1g11, shortly 
after the death of the Author, and was reviewed at pp. 197-198 of our 
nineteenth volume. It was then announced that a number of additional 
plates had been prepared, which it was hoped to publish. This volume 
marks the fulfilment of that promise, and has been prepared by Mrs. 
H. M. L. Bolus, formerly Miss Kensit, B.Sc., and assistant to Dr. Bolus, 
now Curator of the Bolus Herbarium at Cape Town. It contains one 
hundred plates, with text, and is arranged like the preceding volume. 
