Tee 
_ Che Orchid Review % 
Gur VoL. XX, FEBRUARY, 1917. , No. 290. LO 
HE recent article on Cattleya Dowiana and its deriatives (O.R., xxiv. 
p. 270) has aroused a good deal of interest. Besides the article on 
Albinism and Colour in Orchids, by Mr. Thwaites (at page 6) we have one 
from the pen of M. Ch. Maron (at p. 30), relating his own experience with 
C. D. aurea, and it is quite‘evident that there need be no lack of Cattleyas 
having white sepals and petals in the future. The collection of the 
evidence only renders the postponement of the production of whites until the 
second generation the more remarkable. It is evidently not an ordinary 
case of what is called Mendelian segregation, for the so-called recessive 
colour (yellow) does not return, and the dominance of the purple parent, 
which is such a prominent feature in the hybrids of the first generation, is 
in many cases lost, while the new colour, white, evidently represents some 
chemical reaction of the two colours upon each other, which is not 
manifested on their first combination. The matter is well worthy of 
experiment from the chemical standpoint. Incidentally it may be remarked 
that from the evidence it becomes increasingly evident that the white forms 
referred to C. Hardyana are hybrids of secondary origin, the result of the 
recrossing of C. Hardyana with C. Dowiana aurea by insects. C. Hardyana ° 
has been produced artificially on several occasions, and we do not recall any 
white form among the seedlings. 
£2) 
Ea OUR NOTE BOOK. 
Mr. T. L. Mead contributes, at p. 12, a very interesting supplement to 
the article on Cattleya Bowringiana and its hybrids, from which it appears 
that he has paid special attention to this particular species, and has 
succeeded in raising a number of noteworthy additions, those with 
Epidendrum and Lelia Perrinii presenting some distinct and interesting 
features. The system of nomenclature adopted is that of forming a name 
from parts of the names of the parents, but the attempt to extend the 
system so as to indicate the specific composition of the hybrids of any given 
group in a uniform way is novel, and, we are afraid, will not always attain 
the desired object of indicating a complicated parentage without too great 
a strain upon the memory. To take the third name mentioned, Lelio- 
