SCIENCE. 



Editorial Committee : S. Newcomb, Mathematics ; R. S. WooDWARn, Mechanics ; E. C. Pickering, As- 

 tronomy ; T. C. Mendenhall, Physics ; R. H. Thurston, Engineering ; Ira Remsen, Chemistry ; 

 Joseph Le Conte, Geology; W. M. Davis, Physiography; O. C. Marsh, Paleontology; W. K. 

 Brooks, Invertehrate Zoology ; C. Hart Merriam, Vertebrate Zoology ; N. L. Britton, 

 Botany ; Henry F. Osborn, General Biologj' ; H. P. Bowditch, Physiologj' ; 

 J. S. Billings, Hygiene ; J. McKeen Cattell, Psychology ; 

 Daniel G. Beinton, J. W. Powell, Anthropologj'. 



Friday, March 29, 1895. 



coif TENTS: 



The Meaozoic Flora of Portugal compared irith that 

 of the United Stalea : Lester F. Ward 337 



Explanation of Acquired Immunity from Infectious 

 Di.ien.Hes : George M. Sternberg 346 



Kemarking the Slcrican Boundary : 349 



The Nature of Science and its lielntion to Philosophy : 

 E. W. Scripture '. . 350 



' Science ' : 352 



Correspondence : — 353 



A Catalogue of Scientific Literature : W J Mc- 

 Gee. Teaching Botany : W. J. Beal. 



Scientific Literature : — 356 



Lobackersky : ALEXANDER ZlWET. Bastin's 

 Botany : S. E. Jelliffe. Wiley's Agricultural 

 Analynis: Charles Platt. Coutie on the 

 Earthen Atmo.sjjhere : Edward Hart. 



Notes and Aretes .•— 361 



Biology ; Appropriations for the U. S. Geological 

 Surrey ; General. 



Scientific Journals 364 



Neu> Books 364 



MSS. intended for publication and books, etc., intended 

 for review should be sent to the responsible editor, Prof. J. 

 McKeen Cattell, Garrison on Hudson, N. Y. 



Sobscriptionsand advertisements should be sent to Scienxe, 

 41 N. Queen .'^l., Lanciister, Ph.. or 41 East 49th St., New York. 



THE MESOZniC FLOHA OF PORTUGAL COM- 

 PARED WITH THAT OF THE UNITED 

 STATES. 



HISTORICAL NOTICE. 



The earliest studies in tlie Mesozoic de- 

 posits of Portugal seem to have been made 

 by Mr. Daniel Sharpe, who read a paper 

 before the Geological Societj- of London on 

 April 11, 1832, describing certain beds in 

 the vicinity of Lisbon and Oporto ; in the 

 former of which were included strata re- 



ferred by him to the Oolite. On the 9th 

 and 23d of January, 1839, he presented a 

 second paper describing more fully the sec- 

 ondary formations in the vicinity of Lisbon.* 

 On November 21, 1849, Mr. Sharpe read 

 still a third paper before the same societyf 

 of a much more extended nature and de- 

 voted entirelj' to the secondary formation. 

 In this paper is a full list of all the fossils 

 known down to that date carefully deter- 

 mined by Mr. John Morris. Included in 

 these was a single fossil plant regarded by 

 Mr. Morris as a variety of a species of the 

 Yorkshire Oolite called by Phillips Cycadites 

 graminem. It was found at Cape Mondego, 

 and from this circumstance was given the 

 varietal name Mundir. As Mr. Morris re- 

 ferred Phillips' plant to the genus Zamites, 

 the Portuguese plant was made to bear the 

 name Zamitea grmnlneu.'i var. Mxmdm. 



In 1858 Sr. Charles Ribeiro published a 

 series of elaborate papers on the Geology of 

 Portugal,! ti'cating chiefly of the Carbon- 

 iferous ; but in two of tlieseS he considers 

 the Lias and Oolite, mentioning the plant 

 above referred to from Cape Mondego and 



*Geol. Soc. Land., Proc, Vol. I., p. 395 ; Vol. II., 

 p. 31 ; Tran.s., 2d Ser., Vol. VI., p. 115ff. 



t Quart. Journ. Gcol. Soc. Land., Vol. VI., pp. 135- 

 201. 



tMem. Acad. Seal. Sci. de Lisboa, New Ser., Vol. 

 II. 



(i Mina de Carnto de Pedra do Caho Mondego, do di.t- 

 tricto dc Leiria : op. cit., Pt. II., Third and Fourth 

 Memoirs (these memoirs are separately paged). 



