14 
must not be used for a species, or vice versa. But names of 
varieties, mutations or forms are not involved, and it should not 
only be permitted, but strongly advised to use the same term 
for analogous mutations or forms in congeneric species. 
(2) In anything but a very formal paper or list a zoologist 
will not use the double citation for the authority. That is, he 
indicates the name of the writer who first proposed the valid 
specific or other name (in whatever genus), but omits the name 
of the author of the combination. After nearly half a century of 
experience, I can testify that this causes no appreciable incon- 
venience. On the other hand, it saves a lot of printing. There 
is I think, no valid reason why botanists should not follow the 
usage of the zoologists in this matter. The old botanical custom, 
of citing only the author of the combination, can surely have 
nothing said in its favor. It obliterates the historical facts, and 
obtrudes information of minor value, especially now that we 
recognize priority in the same sense as the zoologists. 
BOULDER, COLORADO 
