449 
of Edinburgh^ Session 1864-65. 
that the process of ossification is more liable to disturbance in the 
former than the latter. The modifications in arrangement are 
especially apt to occur along the lines of apposition of adjacent 
osseous areas, i. e., along sutural lines, or along the margins of 
junction of the subdivisions of a bone proceeding from distinct 
centres ; and in these localities it is that the anatomist so fre- 
quently meets with Wormian or triquetral bones, or occasionally with 
a beak projecting from one bone into an adjacent one, or with 
the not unfrequent blending of one bone with another along the 
sutural lines. 
5. On Saturated Vapours. By W. J. Macquorn Kankine, 
C.E., LL.D., F.K.SS. Bond, and Edin., &c. 
As this paper consists almost wholly of formulae, calculations, 
and tables, it is not suited for being read to a meeting ; and there- 
fore the following short abstract of its contents is alone offered for 
the purpose of being read aloud : — 
In the ‘‘Edinburgh Philosophical Journal” for July 1849, the 
author proposed the following formula for the pressure of saturated 
vapour corresponding to a given boiling point : — 
1 A B C 
logp=A-_-_; 
where t is the absolute temperature, reckoned from the absolute zero ; 
and A, B, and 0 are three specific constants, to be determined from 
at least three experiments on each substance ; and he showed that 
the results of that formula agreed better with experiment than 
those of any other formula containing three constants only. In 
a series of papers on the Mechanical Action of Heat, read to the 
Royal Society of Edinburgh in 1850, and subsequent years, and in 
other publications also, the same formula is explained, and its use 
exemplified in various ways. The first division of the present 
paper gives the results of the computation of the values of the con- 
stants A, B, and 0 for several fluids for which they had not been 
previously computed, the data being taken from the second volume 
of M. Eegnault’s “ Relation des Experiences, &c,,” published in 
3 N 
VOL. V. 
