1822.] Cambridge Philosophical Transactions, Part II. 61 
back as 1816, though but just published. We allude to the 
new edition of Professor Robison’s Mechanical Philosophy, 
edited by Dr. Brewster. The article Steam Engine, after having 
been revised by the late Mr. Watt and the learned editor, has 
been put forth by Mr. Murray, as “ the only account of the steam 
engine that can be relied upon.” What claims it possesses to 
this title, may easily be seen by reference toa very simple fact. 
The last steam engine described in Professor Robison’s Me- 
chanical Philosophy, was erected for the Albion Mills, in 1788, 
since which period we find, by turning to Mr. Partington’s ap- 
pendix, that more than one hundred patents have been enrolled, 
many of which are of the utmost importance. 
ia 
Transactions of the Cambridge Philosophical Society, Vol. I. 
Pare LTO TS22. 
From an accidental cause, we omitted to notice the first 
part of this Society’s Transactions ; we, therefore, take an early 
opportunity of giving a brief sketch of the contents of the present 
art. 
I. Analysis of a Native Phosphate of Copper from the Rhine. 
By F. Lunn, Esq. 
As this paper has been given entire in the Annals, it is unne- 
cessary to notice it upon the present occasion. 
IL. Upon the regular Crystallization of Water, and upon the 
Form of its primary Crystals. By Dr. E. D. Clarke. 
This communication of the late and lamented Professor is 
accompanied by a plate, which is indeed requisite to the perfect 
understanding of his views. 
After mentioning various authors who have treated on the 
same subject, and described the appearances which crystallized. 
water assumes, Dr. Clarke concludes his memoir with observ- 
ing: “It is presumed, therefore, that the question respecting 
the crystallization of water may be set at rest by these pheno- 
mena; because it is now no longer a mere inference deducible 
from observing the intersection and disposition of the spicule 
exhibited by water when frozen upon the surfaces of other bodies, 
and in its approach to crystallization; but it is a decided fact, 
shown by regular crystals of ice, that the compound we call 
water, or hydrogen oxide, crystallizes both in hexahedral prisms 
and in rhombi, having angles of 120° and 60°; and that the 
latter is its primary form. ‘The manner too in which these forms 
have been displayed may guide to the crystalline forms of other 
bodies, by inducing a careful examination of the surfaces, points, 
and interstices of all minerals when they are found as stalactites,’ 
The stalactite formation is of all others the most likely formation 
to bear marks of a regular crystallization ; because itis the. result 
