[ 13 ] 
Presents. 
TOYNBEE (J.) Pathological Researches into the Diseases of the Ear. 8vo. 
London ISiQ. 
TWINING (Elizabeth.) Illustrations of the Natural Orders of Plants, ar- 
ranged in Groups, with Descriptions. Parts 1 to 6. fol. Loyidon 184-9. 
WALKER (C. V.) Electric Telegraph Manipulation. 8vo. London 1850. 
WATERSTON (J. J.) An Account of a Mathematical Theory of Gases. 
WELD (Charles Richard.) Arctic Expeditions : a Lecture delivered at the 
London Institution, Feb. 6, 1850, with a Map. 8vo. London 1850. 
Auvergne, Piedmont, and Savoy : a Summer 
Ramble. 8vo. London 1850. 
WHITE (Walter.) Arctic Explorations. 8vo. Edinburgh 1850. 
WILLICH (C. W.) Annual Supplement to Tithe Commutation Tables for 
1850. 
ZANTEDESCHI (F.) Risposta ai Signori E. Knoblauch sulla Esistenza 
delle linee longitudinal! nello Spettro Solare. 8vo. Roma 1849. 
Annali di Fisica. Part 4. 
Donors. 
Tlie Author. 
R. Twining, Esq., F.R.S. 
The Author. 
The Author. 
The Author. 
The Author. 
The Author. 
The Author. 
