Scientific and Medical — continued. 



LIFE AND LETTERS OF JOSEPH BLACK, M.D. By 

 Sir William Ramsay, K.C.B., LL.D., F.R.S., etc. Intro- 

 duction by F. G. DoNNAN, F.R.S. 



Demy 8vo. Frontispiece Portrait and Illustrations. 6s. 6d. 

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ROBERT BOYLE : A Biography. By Flora Masson. 



Frontispiece. Demy 8vo. 7s. 6d. net. 



"May be recommended as an excellent study of the great 

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 modern scientists owe a debt of gratitude." — Pall Mall Gazette. 



THE LIFE OF SIR CHARLES TILSTON BRIGHT. 

 By Charles Bright, F.R.S.E. Revised and Abridged. 



Illustrations. Demy 8vo. 12s. 6d. net. 



" The life story of Sir Charles Bright presents the career of a 

 famous Englishman with all the charm of simplicity and enthusiasm. 

 ... As the chief engineer of the Atlantic cable Sir Charles 

 Bright will always have a memorable place in the scientific pro- 

 gress of this century. . . . These volumes possess a special interest 

 for men of science, but they tell with clearness and simplicity the 

 career of a man of whom Englishmen must always feel proud." — 

 Morning Post. {.Spring 1921.] 



Messrs. CONSTABLE will be glad to send free on 

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