BY JOHN TYNDALL, LL.D., P.R.S., 



^/essor of Natural Philosophy in the Royal Institution 

 of Great Britain. 



55-: — — 



v;ONTIlIBUTIONS TO MOLECULAR PHYSICS IN THE DOMAIN 

 OF RADIANT HEATj 



A Series of Memoirs published in tlie ^Philosophical Transactions' and 

 ' Philosophical Magazine/ with Additions. With 2 Plates and 31 Woodcuts, 

 8yo, price 16s. 



HEAT A MODE OF MOTION. 

 Fourth Edition, with Alterations and Additions -, a Plate and 108 Woodcuts. 

 Grown 8vo, price 10s. Qd. 



SOUND ; 

 A Course of Eight Lectures delivered at the Royal Institution of Great 

 Britain. Second Edition, revised ; with a Portrait of M. Chladni, and 169 

 Woodcut Illustrations. Crown 8vo, price 9s. 



RESEARCHES ON DIAMAGNETISM AND MAGNE- 

 CRYSTALLIC ACTION; 

 Including the Question of Diamagnetic Polarity. With Six Copper Plates 

 and numerous Woodcut Illustrations. 8vo, price 14s. 



FARADAY AS A DISCOVERER. 



New and Cheaper Edition^ with two Portraits. Fcp. 8vo, price 3s. Qd. 



ESSAYS ON THE USE AND LIMIT OF THE IMAGINATION 



IN SCIENCE. 8vo, price 3s. 



FRAGMENTS OF SCIENCE. 



Fourth Edition, revised. 870, price 14s. 



HOURS OF EXERCISE IN THE ALPS. 

 Second Edition ; with Seven Woodcut Illustrations by E. Whymper. Crown 

 8vo, price 12s. Qd. 

 NOTES OF A COURSE OF SEVEN LECTURES ON ELECTRICAL 



PHENOMENA AND THEORIES, 

 Delivered at the Royal Institution of Great Britain^ a.d. 1870. Crown 8vo, 

 price Is. sewed ; Is. Qd. cloth. 



which they contain accessible to those who 

 are but imperfectly acquainted with the 

 physical sciences. The work on diamag- 

 netism and the two courses of lecture-notes 

 on light and electrical phenomena, although 

 of most interest to scientific men, may still 

 be read with pleasure and profit by non- 

 scientists. The lecture-notes especially 

 should be in possession of every lecturer 

 on physics."— Dublin Medical Journal. 



" Dr. Tyndall, whose lectures and works 

 are of world-wide celebrity, is one of the 

 very few men who haVe acquired a solid 

 and well-deserved reputation amongst both 

 non-scientific and scientific persons. His 

 works on magnetism, light, sound, heat, 

 and electricity, have obtained as great a 

 degree of favour as his lectures themselves ; 

 and the simple and clear style in which 

 they are written render the information 



NOTES OF A COURSE OF NINE LECTURES ON LIGHT, 

 Delivered at the Royal Institution of Great Britain, a.d. 1869. Crown 8vo, 

 price Is. sewed, or Is. 6d. cloth. 



" The contents of this little volume fully 

 justify the author in his prefatory remarks, 

 and the intelligent student or teacher will 

 find very great benefit by a perusal of these 

 Notes. Every statement is extremely clear, 

 and the experiments hinted at are all ex- 

 tremely good. Such a publication is ex- 

 ceedingly well adapted to a certain class of 

 minds of which the latent powers are better 

 brought out by hinting at solutions than 

 by detailed explanations. The skeleton is 

 brought before them, and they are called 

 upon to clothe it for themselves. In fact, 

 if physical science is to be used in order to 

 educate and train as well as to inform the 

 mind, we cannot dispense with a set of 

 notes of this description. The author has 

 dealt very fully with his subject, and he has 



not been deterred, when the occasion re- 

 quired, from stepping beyond the physical 

 region into the physiological. Thus we have 

 some very good remarks upon brightness, 

 as well as upon the eye and its peculiarities 

 with respect to light. On the other Land, 

 he has not permitted hi mself to enter largely 

 on the subject of dark rays, but has con- 

 fined himself to those which affect the eye. 

 A perusal of these Notes will benefit all 

 who wish to become acquainted with the 

 laws of light, and even if they sat down to 

 such a task, having a previous acquaintance 

 with every statement, they vdll rise with 

 benefit ; for a branch of knowledge, like a 

 landscape, is never fully understood until it 

 is regarded under difierentatmospberes and 

 from difierent points of view." — Nature. 



London : LONGMANS, GEEEN, and Co., Paternoster Eow. 



lADVBRTISEMENTS continued on 3rd page of Cover. 



