&Mediutn adually hot, add having its heat continually renewed 
by a fountain of heat. 
1 2j How to eftimate the folidity of the Body of Ice, or how 
ftrong is the mutual adhefion of its parts ? and whether differ- 
ing Degrees of Cold may not vary the Degree of the compacft- 
nefs of Ice. And our Author having proceeded as far as he was 
able towards the bringing the ftrength of Ice to fome Eftimate 
by feveral experiments, he communicateth the information, he 
could get about this matter among the Defcriptions that are gi- 
ven us of Cold Regions : And then herelateth out of Sea-mens 
Journals, their Obfervations touching the infipidnefs of refol- 
ved Ice made of Sea- water ; and the prodigious bignefs of it , 
extending even to the height of two hundred and fourty Foot 
above water , and the length of above eight Leagues* To 
which he adds fome promifcuous but very notable ObfervatL 
ons concerning Ice, not fo readily reducible to the foregoing 
Heads: videlicet , Of the blew Color of Rocky pieces of Ice 3 
and the horrid noife made by the breaking of Ice, like that of 
Thunder and Earthquakes , together with a Confi'deration of 
the Caufe, whence thofe loud Ruptures may proceed. 
13, How Ice and Snow may be made to laft long - and what 
Liquor diflolves fee fooner than others, and in what proporti- 
on of quicknefs the folutions in the feveral Liquors are made, 
where occafion is offered t© the Author, to examine , whether. 
Motion will impart a heat to Ice ? After which, lie relates an Ex- 
periment of Ideating a Cold Liquor with Ice, made by himfelfin 
the prefence of a Great and Learned Nobleman, and his Lady, 
who found the Glafs wherein the Liquor was , fo hot that they 
could not endure to hold it in their Hands. Next, it is examined, 
whether the effects of Colddo continually depend upon the ac- 
tual prefence and-influence of the manifeft Efficient Caufes , as 
the Light of the Air depends upon the Sun or Fire, or other 
Luminous Bodies. To this is annexed an Account of thejV®- 
hem way of making Confervatories of lee and Snow, as the Au- 
thor had received it from that Ingenious and Polite Gentleman, 
Matter y. Evelyn, 
