NeXT. 
XV. 
XXII. 
XXIII. 
CONTENTS 
Vou. I. Parr Il. 
On the Principles and Construction of the Achromatic Eye-Pieces 
of Telescopes, and on the Achromatism of Microscopes: by 
MGcaP ID PANLEOL PREIS alate Pare Pat A chetecvaye's minic = tdeWe'e 2 2) wie ere) erat 
An account of a Whale of the Spermaceti tribe, cast on shore on the 
Yorkshire Coast, on the 28th of April, 1825: by James ALDER- 
SONS pbs piss Avaleslaieialeia(elnlsi sin ahelaielsfaiw’= elim nisl sl auxiecicie . 
On a peculiar Defect in the Eye, and a mode of correcting it: by 
Ge Re OE heeo.cun nan OA Ge Cece cere e de cccevsecses 
A general Demonstration of the Principle of Virtual Velocities: 
Gyitie Revel. POWER). che cale(s isis « avelatelalee (sais shel stalevele 
On the Forms of the Teeth of Wheels: by G. B. Arry, Esq..... 
Observations on the Ornithology of Cambridgeshire: by the Rev. 
MUN NSS ciaiehioss ein Ete nerieysinyecoreie anece 
ee ee ed 
On the Influence of Signs in Mathematical Reasoning: by CHARLES 
BaBpace, Esq.....-...-- S56. PE Rae Re Pee: 
On Laplace’s Investigation of the Attraction of Spheroids differing 
little from a Sphere: by G. B. Arry, Esq.........-000-+ 
On the Classification of Crystalline Combinations and the Canons by 
which their Laws of Derivation may be investigated: by the 
Rev. W. WHEWELL......4. 
Reasons for the Selection of a Notation to designate the Planes of 
Crystals: by the Rev. W. WHEWELL.....00-.05 005 aveiciene 
PAGE 
227 
253 
325 
380 
391 
427 
