viii CONTENTS. 



Number 228. 



Page 



Art. LI 1 1. — Temperature of the Moon ; by S. P. Langley, 



with the assistance of F. W. Very 421 



LIV. — Lower Cretaceous of the Southwest and its relation 

 to the underlying and overlying formations ; by C. A. 

 White 440 



LV. — Hinge of Pelecypods and its Development, with an 

 attempt toward a better subdivision of the group ; by 

 W.H.Dall .- 445 



LVI. — Magnetism of Nickel and Tungsten Alloys ; by J. 



Trowbridge and S. Sheldon _ 462 



LVII. — Note on the Measurement of the Internal Resistance 



of Batteries; by B. O. Peirce and R. W. Willson ... 465 



LVIII. — Relation of the Uppermost Cretaceous Beds of the 

 Eastern and Southern United States ; by R. T. Hill : 

 and the Tertiary Cretaceous Parting of Arkansas and 

 Texas ; by R. T. Hill and R. A. F. Penrose, Jr. 468 



LIX. — Description of several Yttria and Thoria Minerals 

 from Llano County, Texas ; by W. E. Hidden and J. B. 

 Mackintosh 474 



LX. — Appendix. — Skull of the Gigantic Ceratopsidse ; by i 

 O. C. Marsh. With Plate XII 501 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Spectroscopic Discrimination of the Rarer Earths, 

 Crookes, 486. — Commercial Organic Analysis, A. EL Allen, 490. — Text Book 

 of Organic Chemistry, A. Bernthsen : The spectrum of Hydrogen : Spectrum 

 of gases at low temperature: New photographic lens: Pin-hole Photography: 

 Blue color of the sky, 491. — Passage of Electricity through gases: Purification 

 of Sewage by Electricity : Elementary Lessons in Rear, S. E. Tillman, 492. 



Geology and Mineralogy. — Tertiary Flora of Australia, Dr. Constantin : Royal 

 Society of Canada : Contributions to Canadian Palaeontology, Canada, J. F. 

 "Whiteaves: Chemical and Physical Studies in the Metamorphism of Rocks, 

 A. Irving, 493. — Eudialyte (?), W. E. Hidden and J. B. Mackintosh: Cata- 

 logue of Minerals and Synonyms alphabetically arranged for the use of 

 Museums, T. Egleston: Materialen zur Mineralogie Russlands, Kokscharow: 

 Index der Krystallformen der Minerahen, V. Goldschmidt: Einleitung in die 

 Chemische Krystallographie, A. Fock, 494. — Composition of uraninite, 495. 



Botany. — What is a Phyllodium ?, 495. 



Miscellaneous Scientific Intelligence. — National Academy: New Bulletins of the 

 U. S. National Museum, published by the Smithsonian Institution in 1889, 

 498. 



Obituary. —George H. Cook, 498. — Leo Lesquereux, 499. — James Prescott 

 Joule, 500. 



Index to Volume XXXVIII, 501. 



Erratum. 

 The notes at the bottom of p. 476 should be transposed. 



