SCIENCK 



[Vol. XVIII. No. 448 



SEO-DARWISISM AND NEO-LAMARCKISM. 



By LESTE.l F. WARD. 

 Annual address o£ the . resident of the Biological 

 Society of Washington delivered Jan. 24, l?»i. A 

 historical and critical review of modern scientiac 

 thought relative to heredity, and especiaUy to the 

 problem of the transmission of acquired characters. 

 The following are the several heads involved in the 

 discussion Status of the Problem. Lamarckism, 

 Darwinism. Acquired Characters, Theones ot He- 

 redity, Views of Mr. Galton, Teachings of Prof es -or 

 Weismann, A Critique of "Weismann, Neo-Darwm- 

 ism, Neo-Lamarckism, the American "School, Ap- 

 plication to the Human Kacc In so far as views 

 are expressed thev are in the main in Una with the 

 general current of American thought, and opposed 

 to the extreme doctrine of the non-transmissibiUty 

 <jf acquired characters. 



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WANTED— Lyell's Prineinles of Geology, second- 

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ANY OF 



Prof. A. MELVILLE BELL'S W 



Elocution — Visible .Speech — 

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For sale or exchange, extra fine pair ( i and ? ) of skins 

 of Rocky Mountain Uoat, with the skulls, etc., as needed 

 for mounting ; collection of vertebrate fossils from the 

 Coup Fork Tertiary of Kansas ; colleclion rf works on 

 descriptive cryptogamic botany — mostly on Fungi; thir- 

 teen vols, of Botanical Gazette, eight vols. Grcvillea, 

 four vols. Notarisea: stereopticon cuifit, with attach- 

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 tolcgy. Prof. F. W. Cragin, Topeka, Kan. 



Botanical specimens for exchange.— Special pains have 

 been taken to procure good mountable specimens fit for 

 any herbarium and no other are oaered. E. F-. Bogue, 

 Orwell, Ohio. 



For exchange or sale at a sacrifice, an elaborate micro- 

 scope outfit. Bullock stand; monocular cbjecuves, one- 

 sixth homeogeneous immersion, four-tenths, and three 

 inch, Bausch & Lomb, also one-fouith and one inch 

 Spencer. Four eye-pieces. Objectives are the best made. 

 Address Mrs. Marion Smith, 41 Branch Street, Lowell, 

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For Exchange A collector of twelve years experience 



has many fine duplicate minerals which he would hke ' - 

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ngto 



De 



Address John Holl, Rollo, Wil 



I would hke to exchange some twenty vols, of the Sec- 

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 vey Reports, for State geological reports not in my 

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