112 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
DIAGRAM SHOWING THE Two Parents AND Four GRANDPARENTS OF 
PAPHIOPEDILUM xX AUREUM (vars.).” 
Pp Ne: pe esp 
S. S. insigne | villosum 
1P 1B 
Spicerianum x nitens 
PAPHIOPEDILUM xX AUREUM (vars.). 
According to the Galtonian law of Ancestral Heredity, these varieties 
should, on the average, show 4 P. Spicerianum + } P. x nitens + } 
P. insigne++} P. villosum ; or to put it more simply, 3 P. Spicerianum + + 
P. insigne + + P. villosum. 
The following facts will show how, in regard to the colours of the 
different parts of the flowers, the Galtonian law seems to be disturbed by 
Partial Prepotency :— 
Colour of Flowers (comprising Upper Sepal, Lower Sepal, Petals, 
Lip, and Staminode). 
(1) P. x aureum.—The parent P. Spicerianum is prepotent in the 
staminode, while the grandparent P. insigne predominates in the upper 
and lower sepals. 
(2) P. x a. Hebe.—The parent P. Spicerianum and the grandparent 
P. insigne together predominate in all parts of the flower, viz. upper 
sepal, lower sepal, petals, lip, and staminode ; indeed this variety might, 
at first sight, pass as a form of P. x Leeanum (P. Spicerianum x P. 
insigne), buta careful examination reveals the influence of P. villosum, 
especially in the shape and general habit of the flower. 
(8) P. x a. Surprise.—The whole flower in colour resembles a 
greenish form of P. insigne Sander, the spots of P. imsigne and the 
ruby band of P. Spicerianum being quite obliterated in the upper sepal ; 
yet, in form and a few minor details, its full parentage may be traced. 
(4) P. x a. virginalis.—The parent P. Spicerianum predominates 
in the upper sepal and staminode, while P. villosum preponderates in 
the petals and lip. This variety would almost pass for a compact form 
of P. x Lathamianum (P. Spicerianum x P. villosum), but differs again 
in minor details, confirming its parentage. 
(5) P. x a. Augusta.—The parent P. Spicerianum and the grand- 
parent P. insigne together predominate in the upper sepal, while 
P. Spicerianum alone preponderates in the staminode. 
(6) P. x a. Eteocle——The parent P. Spicerianum predominates in 
the upper sepal, the grandparent P. villosum in the petals, while P. 
Spicerianum and P. insigne together preponderate in the staminode. 
(7) P. x a. Hermione.—The parent P. Spicerianum predominates 
in the upper sepal, P. insigne and P. villosum together preponderate in the 
petals, while P. Spicerianum and P. insigne prevail in the staminode. 
(8) P. x a. Hermode.—The parent P. Spicerianum and the grand- 
