a Medium adually hot, and having its heac eontiaunHy rtat v. i i 
by a fountain of heat. 
1 23 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 compadt- 
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 he relateth out of Sea-mens 
fmrnals, 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 Obfervati^ 
ons concerning Ice, notfo readily reducible to the foregoing 
Heads: videlicet^ Of the blew Color of Rocky pieces of Ice 5 
and the horrid noife made by the breaking of Ice, like that of 
Thunder and Earthquakes 5 together with a Confideration of 
the Caufc, whence thofe loud Ruptures may proceed. 
1 3, How Ice and Siiowm^y b £0 laft long | and what 
Liquor diffolves Ice fooner than others, and in what proporti- 
on of quicknels the folutionsintba feveral Liquors are made, 
where occafion is offered tq the Authorj^. to examine , whether 
Motion will impart a heat t6 Ice ?- After which,he relates an Ex- 
periment of /f^^^^W^ a 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. Nextjt is examined, 
whether the effe^s of Cold do continually depend upon the ac- 
tual prefence and influence of the maoifeft 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 the/f^i- 
lianvi2Cf of making Confervatories oi IceandSnow^ as the Au^ 
thor had recei ved it from that Ingenious and Polite Gentleman^ 
Mafter Evelyn, But 
