REPORT OF THE CONFERENCE ON GENETICS. 45 
Orcuips.—Photographs of flowers of forms of Paphiopedilum x Hera 
showing segregation of spotted sap pattern and striped sap pattern (for 
details see Journ. R. H. S. 1908, vol. xxvii. pp. 614-624). These photo- 
graphs are reproduced with the Hybrid Conference paper. 
ANTIRRHINUMS.—Specimen flowers of the dwarf races, ‘Crimson King,’ 
‘Yellow Prince,’ and ‘White Queen,’ and their hybrid forms, showing 
Mendelian dominance in F’, of red over yellow, red over white, and white over 
yellow corolla segments ; segregation of these characters in F, in Mendelian 
proportions ; also illustrating the compound nature of the red colour of 
‘Crimson King’ i.e. red based on yellow (for details see Hybrid Con- 
ference paper). 
Tomatos.—Specimens of tomato fruits showing Mendelian dominance 
in F, of red over yellow flesh, and yellow over white skin; Mendelian 
segregation in F, into 9 red flesh in yellow skin: 3 red flesh in white 
skin: 3 yellow flesh in yellow skin: 1 yellow flesh in white skin; 
also illustrating the compound nature of the red colour of the ‘ Fireball ’ 
tomato, z.e. red flesh in a yellow skin (for details and photograph of the 
exhibit see the Hybrid Conference paper). 
SwEEeT PEAs.—Specimen flowers of ‘ Black Knight,’ ‘Sadie Burpee,’ 
‘Pink Cupid,’ ‘White Cupid,’ ‘Salopian,’ ‘ Dorothy,’ and their hybrid 
forms, showing Mendelian dominance in F’, of red over white, purple over 
red, tall over cupid, long over round pollen ; segregation in F, in Mendelian 
proportions and purity of recessives in F3. 
ExuHisit oF Puants By R. Irwin Lyncu, V.M.H., Botanic 
Garden, Cambridge. 
This was an exhibit of great general interest and suggestiveness, 
but was not intended to illustrate Mendelian laws. Among the plants 
shown were two remarkable hybrid ferns, one, Polypodiwm Schneideri, be- 
tween P. vulgare elegantissimum and P.awrewm, the other, Scolopendrium 
hybridum, between S. vulgare and Aspleniwm Ceterach, the first being 
undoubtedly hybrid and easily obtained by making a mixed sowing of the 
spores, and the second certainly showed strong evidence of hybrid 
character; see also p. 50. A very good Nepenthes hybrid was shown in 
N. Allardi, raised between N. Veitchit and N. Curtisii by Mr. Allard, 
foreman in the Cambridge Botanic Garden, which, though very near to 
one or two similar hybrids, is still quite distinct. 
Mr. Lynch also showed the very remarkable Kalanchoé kewensis, 
raised at Kew between K. flammea and K. Bentii. A hybrid in the 
same genus, but of less importance, raised in the Cambridge Botanic 
Garden between K. grandiflora and K. Kirkii, was shown as K. cantabri- 
giensis. A hybrid Sarracenia, also raised in the same garden, by the 
Curator, between S. Drummondii and S. variolaris was of horticultural 
interest because of its fine size and colour, resembling a gigantic 
S. variolaris, with the fine coloration of a good form of S. Drummondii. 
From Professor Macfarlane we learn that some at least of these garden 
hybrids are found wild in nature. Begonia weltoniensis, raised many 
years ago by the late Colonal Trevor Clarke, was shown as having a colour 
apparently not possessed by either parent. The explanation, however, is 
