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BOLUS (H.). ICONES ORCHIDEARUM AUSTRO AFRICANARUM EXTRA TROPICARVM ; or figures with 



descriptions of extra tropical South African orchids, Vol. I, with xoo colored and plain pbtcs, 8vo, cloth. i8qv 



96, £l'2%. r , , . vj 



JACKSON (B.) GUIDE TO THE LITERATURE OF BOTANY. Including nearly 6,000 titles not given in Prit/cli* 



Ihesaurus, 410, cloth, i88i, £\, 



—VEGETABLE TECHNOLOGY, a contribution towards a bibliography of economic botany, with a compre- 

 hensive subject-index, 410, cloth, 1882, 12s. 



MILLS (F.) and R. PHILIP— THE DIATOMACEAE OF THE HULL DISTRICT with illustrations of 600 species, 



16 plates, 8vo, xgoi, 4s 6d, 



SANDER'S ORCHID GUIDE, containing all the best known species, varieties, and hybrids of orchids in cultivation, 



together with the names and parentage of all the known hybrid orchids up to date, Jan. i, 1901, roy. 8vo, half 

 roan, T901, los 6d. 



SIM (T.) THE FERNS OF SOUTH AFRICA, containing descriptions and figures of the ferns and fern allies 



of South Africa, with localities, cultural notes, etc., with 159 plates, 8vo, half bound, 1892, £,1 is. 



VAN HEURCK (H.) A TREATISE ON THE DIATOMACEAE, containing introdiictor>- remarVs on the structure, 



life history, collection, cultivation and preparations of diatoms, and a description and figure typical of every 

 known genus, as well as a description and figure of every species found in the North Sea and countries bordering 

 It, Translated by W. E. Baxter, 36 plates and engravings (2,000 figures) imp. 8vo, cloth, 1896, ^2, 



FOR SALE 



SOWERBY (J.) and J. E. SMITH— ENGLISH BOTANY; or colored figures of British plants, with their e^^mtial 



characters, synonyms, and places of growth, with general indexes and supplement (in five vols.) by W. Borrer, 

 C. Babington, W. Newbould, the figures by J, de C. Sowcrby and J. Salter, 2,998 colored plates, 41 vols. roy» 

 8vo, half morocco, 1790-1866, £57 155. An absolutely perfect copy ending with plate 2,998 (the last published) 

 and the text to plate 2,999. 



WILLIAM WESLEY & SON, booksellers and publishers 



28 Essex Street, Strand, London 



Cbeir 



Eight Lectures Delivered Before 



Lowell Institute in 1899 



Illustrated by io8 Text Figures 

 »nd 2 Colored Plates .... 



By ALBERT A. MICHELSON 



^ofessor and Head of the Department of Physics 

 irectorof Ryerson Physical Laboratory 



Issued as Volume III of the Second 

 Scenes of the Decennial Publications of 

 ' University of Chicago, pp. xii+164, 



'' cloth, net, $2.00; postpaid, $2,15 



CD« University oT Chicago Press 



CHICAGO, ILLINOIS 



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58TH ST. .ND ELLIS AVC. CHrCAtjU 



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