4 Nomenclature of Zoology. 
2. The binomial nomenclature having originated with Linnzus, the 
law of priority, in respect of that nomenclature, is not to extend to the 
writings of antecedent authors. 
3. A generic name, when once established, should never be cancelled 
in any subsequent subdivision of the group, but retained in a restricted 
sense, for one of the constituent portions. 
4. The generic name should always be retained for that portion of the 
original genus which was considered typical by the author. 
5. When the evidence as to the original type of a genus is not perfect- 
ly clear and indisputable, then the person who first subdivides the genus, 
may affix the original name to any portion of it, at his discretion, and no 
later author has a right to transfer that name to any other part of the 
original genus. 
6. When two authors define and name the same genus, both making it 
of exactly the same extent, the latter name should be cancelled iz toto, and 
not retained in a modified sense. 
7. Provided, however, that if these authors select their respective 
types from different sections of the genus, and these sections be after- 
wards raised into genera, then both these names may be retained in a re- 
stricted sense, for the new genera respectively. 
8. If a later name be so defined as to be equal in extent to two or more 
previously published genera, it must be cancelled zn toto. 
9. In compounding a genus out of several smaller ones, the earliest of 
them, if otherwise unobjectionable, should be selected, and its former 
generic name be extended over the new genus so compounded. 
10. A name should be changed, which has before been proposed for 
some other genus in zoology or botany, or for some other species in the 
same genus, when still retained for such genus or species. 
11. A name may be changed, when it implies a false proposition, 
which Is likely to propagate important errors, e. g. Picus cafer, for a Mex- 
ican bird. 
12. A name which has never been clearly defined in some published 
work, should be changed for the earliest name by which the object shall 
have been so defined. 
13. A new specific name must be given to a species, when its old name 
has been adopted for a genus which includes that species. 
14. In writing zoological names, the rules of Latin orthography must 
be adhered to. 
On the first nine propositions we have no comments to make. 
Section 10, seems to us somewhat questionable. The different 
branches of natural history, botany and zoology, and indeed the 
different departments of zoology, have now become so extensive, 
and are pursued by students so much to the exclusion of each 
