i ENGRAVINGS, 
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Vol. XX. is illustrated: ‘with a ‘Quarto Plate to illustrate the . nat 
oe ae 
Vol. XXI. is illustrated with a Portrait of Dr. Hurron; engraved by 
Kwigur, from a Likeness painted by Miss Byrne—The Perambles.nasuta 
engraved by Lowry—The Peraméeles obesula; also engraved by Lowry. 
Mr. Rawttnson’s improved Mill for grinding Oil Colours; and anim- 
proved Mill for grinding Indigo, or other dry Colours—Mr. Harpy’s ime | 
proved Methdd of Banking the Balance of a Time-keeper—A Plan of Mr. - 
'Butzocx’s improved Draw-back Lock—Mr. Bowxer’s Screw-Press—A 
Survey to illustrate some Geographical and Topographical Improvements ~ 
proposed by J. Courcuman, Esq. Member of the Imperial Academy of ~ 
‘Sciences at Petersburgh—Chevalier Epsncrantz’s Safety;Valve for Steam — 
Engine Boilers—A 4to plate containing magnified Representations of the © 
Parasitic Plant which causes the Blight in Corn, engraved by Permission of _ 
the Rt. Hon. Sir Josep Banxs, P.R.S. from the original Drawings. > 
Vol. XXII. is illustrated with a Quarto Plate containing magnified Re- | 
presentations of the Parasitic Plant which, causes the Blight in Corn: _ 
engraved, by permission of the Right Hon. Sir Joszeru Bawxs, P.R.S. — 
from the original Drawings.—A Plate containing Mathematical Figures to | 
illustrate the best Form to be given to a Plough-ear; to illustrate a Paper — 
by President Jerrerson—A Portrait of Dr. Prigsriey, from a Model | 
taken from the Life. Engraved by E. Mackxenz1s—A nondescript Aquatic — 
Insect, and microscopic Views of the Parts—Also Figures to illustra 
Paper on Elasticity—A Plate respecting the Physiology of Vegetabl 
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