PHILOSOPHICAL TRANSACTIONS. 
I. Bakerian Lecture.— On the Constitution of the Copper-Tin Series 
of Alloys. 
By C. T. Heycock, 
F.B.S., and F. H. 
Neville, F.B.S. 
ReceiA^ed February 26,—Read February 26, 1903. 
[Plates 1-11.] 
Contents. 
Section I.— Summary of Results. 
The cooling curves. 
The temperature concentration diagram. 
The solidus. 
The substances occurring in the alloys. 
Classification of the alloys into groups. 
Section II.—On the Solidification of a Metal. 
The development of a pattern. 
Preparation of the ingots. 
The melting-point and the rigidity of the alloys at high temperatures . . 
Section III.— The Microscopic Study of the Alloys. 
Identification of the substances as seen in the photographs. 
The evidence from the microscojiic structure of the chilled alloys . . . 
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SECTION I. 
Summary of Results. 
The immediate origin of the present jiaper lay in a suggestion of tire late 
Sir G. G. Stokes, made early in 1900, that we should attempt the microscopic 
examination of a few bronzes as an aid to the intei'pretation of the singularities of 
the freezing-point curve. Tliis curve was at the time fairly accurately known, 
largely through the researches of the late Sir W. PiOBErts-Austen and 
Dr. Stansfield, published in 1895 and in 1897, and partly by our own work. 
Microsco|)ic studies of the alloys had been also published by Dr. Cfiarpy and by 
Mr. Stead, but, so far as we are aware, no attempt had been made to correlate the 
VOL. CCII.—A 346. B 2.10.03 
