217 
formity of nomenclature which can be obtained only by adopting 
the law of priority. Mr. Hanbury himself, in his arrangement of 
the Hieracia, consistently and correctly uses the Linnaean names of 
LTieracium alpinum and H. Murorum in a more restricted sense 
than did Linnaeus.” 
“But, unfortunately, another practice, which is, I think, to be 
strongly deprecated, has been followed in some cases, which con- 
sists in giving up the older name, which, according to the rule of 
Priority, should be adopted for a more recent one, because the 
species as first cece) is now considered to be made up of more 
than one species.” N. 4 3, 
Flora of Nebraska, part 21, Rosales. Per Axel Rydberg. 
Edited by the members of the Botanical Seminar of the Univer- 
Sity of Nebraska. Lincoln, 1895 (issued December 30). $1.00. 
This is a very welcome addition to local botany and is the 
Second part issued of this excellent work. 
After discussing certain points concerning the morphology and 
terminology of different parts of the flower, the author takes up 
the order of Calyciflora, beginning with the family Rosaceae. 
Schemes of the relationships of the higher groups are inserted 
and keys to all the groups from the suborders to species are 
given. The idea in the treatment of the families and species is seg- 
regation, thus avoiding much confusion. In place of Leguminosae 
we find Caesalpinaceae, Mimosaceae and Papilionaceae, while 
the Grossulariaceae are taken out of Saxifragaceae. 
Psoralea collina, Kuhnistera candida di iffusa, Lathyrus ornatus 
Jtavescens, L. ornatus incanus and Ribes aureum chrysoccum are des- 
cribed as new. The nomenclature is based on the most advanced 
and practical ideas. An excellent feature of the work is the 
numerous original plates which contain figures showing the diag- 
nostic characters of the several tribes. All the Nebraska species 
of Astragalus are figured, J.K.S. 
Lhe Potomac Formation. Lester F. Ward. t5th Ann. Rept. U. 
S. Geol. Surv. 1893-94 [ Washington, 1895], 307-397. pl. 2-4. 
and illust. in text. 
The value of this contribution will be appreciated by the 
geologist more than by the botanist, but the botanist will find it 
of interest for the reason that emresetinnd plays such an impor- ce 
