354 THE ORCHID REVIEW. (DECEMBER, 1914 
tendency to reversion, however, had been overcome by recrossing with the 
albino parent. One slide showed the result of crossing C. Leeanum with 
C. insigne Sandere, yielding C. Actezeus, which recrossed with the same 
pollen parent gave C. San-Acteus, and in the next generation C. San- 
ac-derze, which possessed the same albino characteristics as the original 
C. insigne Sander. Other albinos were capable of reproducing their 
characteristics when self-fertilised, and there were several cases where two 
whites crossed had produced true albinos, as in the case of Cattleya 
intermedia alba x C. Mossize Wageneri, producing the well-known C. 
Dusseldorfii Undine. 
The genus Calanthe showed some of the highest results hybridisation 
had yet achieved, and Mr. Chapman expressed the opinion that if similar 
progress were obtained in other families of plants in the future there will be 
such a distribution of colour as can hardly be imagined. At the outset C. 
vestita, a white flower having a purple disc, was crossed with C. rosea, 
having small rose-coloured flowers, yielding the well-known C. Veitchii, 
and all of which were shown, together with slides of the succeeding 
generation. Further crossing had yielded such diverse varieties as the 
rich carmine-rose C. Angela and C. Chapmanii. The colour had been 
turned completely inside out, the white occurring in the central disc and 
the deep red on the sepals and petals and outer lubes of the lip. This 
development was illustrated by a series of slides. 
Turning to the bigeneric hybrids, the lecturer said that they were now so 
numerous as to form a subject that could only be treated thoroughly if an 
evening were reserved for them, but he showed slides which illustrated 
some of the more important crosses, particularly among the Odontiodas, 
of which some remarkable and beautiful flowers were exhibited. A 
long series of hybrids of the most diverse genera, with their parents, were 
shown and were greatly admired. 
In opening the discussion which followed the exhibition of the slides 
Mr. R. A. Rolfe reviewed some of the subjects upon which the lecturer 
had touched. With regard to the great preponderance of blotched forms 
found among hybrid Odontoglossums, he thought it was a case of reversion. 
Taking the genus as a whole, the yellow and blotched forms were far more 
numerous than the white, which latter might be regarded as the latest stage 
of development, and reversion was a common feature among hybrids. The 
sections of the ovary of the Old and New World Cypripedes thrown upon 
the screen were interesting, and showed a fundamental difference between 
the two groups. And there was another difference, which Dr. Lindley 
always anticipated would be found, but failed himself to detect, namely, 
that in the former the sepals were imbricate but in the latter valvate. The 
difference was well seen by cutting a bud across. For along time the two 
