Geology and Paleontology. 921 
Albrecht, P.—Ueber die cetoide Natur der sp marsnemelet Anatomis- 
thor 
cher Anzeiger. 86. rom the au 
Dollo, a ay Seer has et Cai ie. Comptes-Rendus. 1888. 
From he author 
Branner, J. C. -The Glacial Striæ of the Lackawanna-Wyoming 
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TENN F. S.—Swine Plague: its Causes, ew hy and Prevention. 
Bull. Agric. Exper. Station of Nebraska. 1888. From the author. 
Cook, A. J.—Experiments with i meh Agric. Coll. of Michigan. 
Bull. No. 39. From the author 
Meyer, O.—On Miocene Sinvvettabietien from Virginia. Amer. Philo. 
Soc. 1888. From the author 
Riley, C. V.—On the ‘Cases of Variation in Organic Forms. Address 
before the A. A. A. S., Cleveland. 1888. From the author. 
Armas, J. I. de.—La Zoelogli de oe y de los primeros exploradores 
de Amer erica. From the author 
McGee, W. J.—Three Formations of serch eet Atlantic Slope. Amer. 
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Geikie, A. L.—Report on the Recent We of the Geological Survey in 
the eee Highlands of Scotland. Quart. Jour. Geol. Soc., 
1888. 
Hauchecorne.—Compte Rendu de la me. Session = he i Géologique 
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Fritsch, A.—Fauna der Gaskohle und der njoe ve Perm Form 
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From the author 
GENERAL NOTES. 
GEOLOGY AND PALÆONTOLOGY. 
AS gs oF GRAVITY IN APPROACHING THE CENTRE OF 
ANY Cosmic SPHERE WHATEVER.—First, within a hypothetical 
hollow hitar a solid shell of which is, in all parts, of ual 
the gravity of Q, and g lr the gravity of q: then wil will mie qr: 
G : g, and there results Q X g = G X q, or g = a 
