84 J. H. MAIDEN. 
seems useful or necessary, by a name. The formula consists of 
the names or specific epithets of the two parents in alphabetical 
order and connected by the sign x. When the hybrid is of 
known experimental origin the formula may be made more precise 
by the addition of the signs 9, ¢. The name, which is subject 
to the same rules as names of species, is distinguished from the 
latter by absence of an ordinal number and by the sign x before 
the name. 
Examples: x Salix capreoia = Salix aurita x caprea,; Digi- 
talis lutea 2 x purpurea 8; Digitalis lutea § x pupurea 9.” 
Article 35. ‘Publication is effected by the sale or public distribu- 
tion of printed matter or indelible autographs. Communications 
of new names at a public meeting, or the placing of names in 
collections or gardens open to the public, do not constitute publi- 
cation.” 
Article 36. “On and after January 1, 1908, the publication of 
names of new groups will be valid only when they are accompanied 
by a Latin diagnosis.” 
’ 
A “group” is defined in Article 138, and includes a 
species. 
Article 37. “A species or a subdivision of a species, announced 
in a work, with a complete specific or varietal name, but without 
diagnosis or reference to a former description under that name, is 
not valid. Citation in synonymy or incidental mention of a 
name is not effective publication, and the same applies to the 
mention of name on a ticket issued with a dried plant without 
printed or autographed diagnosis. Plates accompanied with 
analyses are equivalent to a description; but this applies only to 
plates published before January 1, 1908.” 
Article 39. “The date of a name or of a combination of names 
is that of their effective publication. In the absence of proof to 
the contrary, the date placed on the work containing the name or 
combination of names is regarded as correct. On and after 
January Ist, 1908, the date of publication of the Latin diagnosis 
only can be taken into account in questions of priority.” 
