102 PALEOBOTANY [Box. Absts., Vol. X, 



648. KiDSTON, R., AND W. H. Lang. On the old red sandstone plants showing structure 

 from the Rhynie Chert bed, Aberdeenshire. Parts 4 and 5. [Abstract.] Proc. Roy. Soc. 

 Edinburgh 41^: 117-llS. 1921. 



649. MacBride, E. W. The method of evolution. Scientia 28: 23-33. 1920. 



650. Mendiola, N. B, On the evolution of the corn ear. Philippine Agric. Rev. 13: 

 112-114. PI. 1-4. 1920. — The author gives additional data, with illustrations, confirming 

 Montgomery's theory that the ear of corn originated from the central spike of some tassel- 

 like structure similar to the corn tassel. — E. D. Merrill. 



651. MokelIjET, Lucien and Jean. Nouvelle contribution a I'etude des Dasycladacees 

 tertiaries. [New contribution to the study of the Tertiary Dasycladaceae.] Compt. Rend. 

 Sommaire Soc. Geol. France 10: 135-136. 1921. — Preliminary notice is given of a memoir on 

 these algae which will be published in the Memoirs of the Society. — E. W. Berry. 



652. Petronievics, Branislav. Lois de revolution des especes, des rameaux phy- 

 letiques et des groupes. Rev, Gen. Sci. Pures et Appl. 32: 140-143. 1921. 



653. ScHUCHERT, Charles. The evolution of primitive plants from the geologist's view- 

 point. New Phytol. 19: 272-275. 1920. — In the course of favorable comment on Church's 

 Thallasiophyta and the Subaerial Transmigration, the author points out that there was never 

 a universal ocean, that the amount of water in the hydrosphere has increased during the 

 geological ages, and that the Archeozoic oceans had far less salts and probably a different salt 

 combination than the ocean of today. [See also Bot. Absts. 7, Entry 2007.] — I. F. Lewis. 



654. Seward, A. C. The Cretaceous-Tertiary boundary in North America. [Rev. of: 

 Lee, Willis, T., and F. H. Knowlton. Geology and paleontology of the Raton mesa and other 

 regions in Colorado and New Mexico. U. S. Geol. Surv. Professional Paper 101.] Nature 

 107: 282-283. 1921. — Conclusions are regarded as of great interest from a geological point of 

 view. Both Vermejo and Raton formations are rich in fossil plants; the former is correlated 

 with the Montana flora, the Raton is believed to be Eocene. It is unfortunate that little 

 attempt is made to compare the plants with species other than American. The absence of 

 conifers in Raton is interesting, but it is scarcely safe to assume the group was unrepresented 

 in the contemporary vegetation of the district. — 0. A. Stevens. 



655. Seward, A. C. Plant evolution. [Rev. of: Scott, D. H, Studies in fossil botany. 

 Srd ed. Vol. 1. Pteridophyta. Srd ed., xxiii + 434 p. A. and C. Black: London, 1920 (see 

 Bot. Absts. 8, Entry 2092).] Nature 107: 197-198. 1921. 



656. Vaulx, R. db la, bt P. Marty. Adjonctions k la flore fossile de Varennes. [Addi- 

 tions to the fossil flora of Varennes.] Rev. G6n. Bot. 33:238-243. PI. 4-5. 1921.— Five species 

 are added to the list of plants reported in the fossil flora of Varennes. They are: Salix cinerea, 

 Ulmus ciliata, Ahronia Bronnii, Rubus niacensis (R. caesius), and Coloneaster Boulayi; the 

 last is new to fossil floras in general. Of these, the first 4 exist in the Tertiary flora of the vol- 

 cano of Cantal, and all but Abronia Bronnii are still found as part of the indigenous flora of 

 Mont Dora. Cotoneaster Boulayi is Asiatic and Abronia Bronnii North American. — J. C. 

 Gilman. 



