APRIL, 1908.] THE ORCHID REVIEW. 103 
_ absent, the sap is colourless. With regard to the cases of Paphiopedilum 
(Cypripedium) brought forward by Mr. Chapman, for the sake of simplicity 
we will call the two colour factors C.and P. The typical coloured forms 
of P. insigne, P. bellatulum, P. callosum, and P. Lawrenceanum will 
therefore be carrying both of the colour factors C and P. Their albinos 
will, on the other hand, be carrying either the C factor alone, or the P 
factor alone (or neither). The known facts of the breeding of albinos of 
these four species seem to be in accordance with the conception that P. 
insigne Sandere and P. bellatulum album are carrying the factor C alone; 
while P. callosum Sandere and P. Lawrenceanum Hyeanum are carrying 
the factor P alone (or vice versa) as the following table, comprising all the 
results known to me, shows :— 
TABLE A. 
1, P. insigne Sander (C) X P. insigne Sander (C) gives albinos (C C). 
2, P. callosum Sanderz (P) xX P. callosum Sander (P) gives albinos (P P). 
3, P. Lawrenceanum Hyeanum (P) X P. Lawrenceanum Hyeanum (P) 
gives albinos (PP). 
4, P. Lawrenceanum Hyeanum (P) X P. callosum Sandere (P) gives 
albinos (PP). 
5, P. callosum Sandere (P) X P. insigne Sandere (C) gives coloured 
hybrids (C P). 
6, P. callosum Sandere (P) X P. bellatulum album (C) gives coloured 
hybrids (C P). 
>, P. bellatulum album (C) X P. Lawrenceanum Hyeanum (P) gives 
coloured hybrids (C P). 
The next table gives the remaining possible matings between the 
albinos concerned, together with the expected results :— 
TABLE B. 
1, P. bellatulum album (C) xX P. bellatulum album (C) should give 
albinos (C C). 
2, P. bellatulum album (C) x P. insigne Sandere (C) should give albinos 
(C C) 
3, P. insigne Sandere (C) X P. Lawrenceanum Hyeanum (P) should give 
coloured hybrids (C P). 
Future results will show how far the above conception, based on 
Mendel’s Law, is correct. If Mr. Chapman thinks well to self the coloured 
hybrids that he obtained from two albinos, he may expect to get, on the 
average, nine coloured forms to seven albinos.” 
At the meeting held on January 28th the hybrid between P. insigne 
Sander and P. bellatulum album was exhibited by Messrs. asimenpantetins & 
Brown, of Tunbridge Wells, and was thus recorded (O.R. xvi. p. 72): “A 
