310 BOTANICAL GAZETTE [ocroBER 
use of the priority rule and from an imperfect description such as AGarpn’s, 
which suits not only a great number of different algae within various groups, 
among them diatoms, red algae, Myxophyceae, and Chlorophyceae, but also insect 
eggs. He advocates therefore the necessity of furnishing not only a complete 
diagnosis, but also a good drawing of every new form of thallophytes described. 
—OLSSON-SEFFER. 
MacDovuceat has published several short papers that will be of interest to 
the readers of these notes. In a paper entitled “Soil temperatures and veget- 
tion”*3 he gives the results of his thermographic studies, and concludes that too 
little attention has been paid to soil temperatures; it seems likely that diurnal and 
seasonal variations, and differences in the temperatures of aerial and subterm 
nean portions must have a large influence on physiological processes, both directly 
and indirectly. In “Some aspects of desert vegetation ””*4 and “ Botanical explon- 
tions in the Southwest ”’?s he gives interesting popular accounts of our deserts and 
their vegetation, and shows the possibilities of the Desert Laboratory in shed: 
ding light on the origin of species. ‘Mutation in plants’?° is a sympathetic 
presentation of the mutation theory, in which the author gives the results of his 
own cultural studies. The mutants have in all respects the specific characteristics 
of their Holland prototypes. “Some correlations of leaves”?? deals with “fi 
results obtained in the further development of the shoot and leaf, when resort 8 
had to defoliation. Extra development was awakened in stipules and other 
organs.—H. C. Cow Les 
Witte and Wrrrrocx?® submit to the next International Botanical Congress 
the right of prionty 
it will be 
necessary to publish in the future not only a description, : 
ism under consideration, sufficiently clear to make the diagnosis of the oe 
understood. II. In order to maintain the right of priority for new ee 
the thallophytes, besides the description there shall also be published (or ath 
to) a figure of at least one species among those comprising the genus — The 
III. These resolutions shall be in force from the first of January is 
most beneficial results that would be obtained if these proposals wi 
would be that the identification would be considerably aided by having - 
to refer to; such figures would in the future be executed with greater 
23 Contrib. N. Y. Bot. Gard. no. 44. Mo. Weather Rev. Aug. 1993 
24 Contrib. N. Y. Bot. Gard. no. 46. Plant World 6:249-257- 1903- 
#5 Jour. N. Y. Bot. Gard. 5:89-98. 1904. ; 
26 Contrib. N. Y. Bot. Gard. no. 48. Amer. Nat. 37:737-77° 1903- 
27 Contrib. N. Y. Bot. Gard. no. 43. Bull. Torr. Bot. Club. 30:503-3!?" ee 
28WILLE, N., and Wirrrocx, V., Motion au Congres international ai pear he 
Deuxitme Session, Vienne 1905. Nyt Magasin Naturvidenskaberne 42:2" 
Igo4. ’ 
