620 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



and P. Boxallii, is known as P. x Calypso, and was first raised by Messrs. 

 Veitch in 1891. 



The latter, BI, the hybrid between P. insigne and P. Boxallii, is known 

 as P. x Schlesingerianum, and was first raised by Messrs. Seeger & Tropp, 

 of Dulwich, in the same year. 



Specimens of these hybrids and their varieties are in my collection, so 

 that I have been able to compare them all side by side with my P x Hera 

 (SI xB) hybrids. 



In order that readers may follow the results of my analysis of the 

 forty- nine hybrids of SI x B, and compare them for themselves by means 

 of the photographs, I will give the details of each of the three single 

 characters in the three original species and the three hybrids concerned, 

 that is to say, as far as the poverty of language will permit ; for it 

 is a well-known fact that verbal descriptions, try how one may, 

 quite fail to represent the forms and colours of Orchids as they appear 

 to our eyes. 



To those who know the species and hybrids concerned in this in- 

 vestigation, the accompanying photographs (figs. 167, 168, and 169) will 

 speak more eloquently than words. 



The following are the details of the characters : — 



1. The Ground-colour of the Dorsal Sepal. 



(a) In S this is white, with a small green area at the base. 



(b) In I it is yellow-green, with a broad white apex. 



(c) In B it is dark green up to the apex, with a narrow margin of 

 white around the edges. 



(d) In SI it is white in the upper half and yellow-green in the lower 

 half, the size and colour of these areas varying between those of the two 

 parents S and I. 



(e) In BS it is white in the upper half and dark green in the lower 

 half, the size and colour of these areas varying between those of the two 

 parents B and S. 



(/) In BI it is yellow-green, with white apex and margins, the 

 size and colour of these areas varying between those of the two parents 

 B and I. 



An analysis of the 49 hybrids SI x B, obtained by careful comparison 

 with the above forms in regard to the single character of the ground-colour 

 of the dorsal sepal, gives : — 



20 BS, comparable with the various forms of P. x Calypso (BS), and 

 29 BI, comparable with the various forms of P. x Schlesingerianum 

 (BI). In no case does there appear to be either a BSI or SI. In regard 

 to this single character, therefore, the facts are apparently in accordance 

 with Mendel's theory. 



2. The Markings upon the Ground-colour of the Dorsal Sepal. 



(a) In S these are generally absent, though there are a few claret- 

 coloured hairs scattered over the white surface of the flower, giving it a 

 rosy tint. 



