^ 



H 



ies 



ov 



retn 



er 



en^. 



IS, tliat 



vaporat- 



ey arrive 

 ter velo- 



Qm. So 



f regions 

 ly direc- 

 :h moves 

 me, and 



degrees, 



f 



kc u red 



coverin,? 







, as they 

 e, which 



them i^i 



fcles, as 



ti 



bulk 



1 



^ 



the 



fter 



before, 



fror^ 



IS 







r 



itar 

 ears? 



Sect. XIII. 2. 2. 



ELECTRICITY. 





07 



pears, that mold clay becomes denfer or more folid by being frozen 



and if this fhould not occur, yet it would quickly become as folid a 



before by the felf-attraaion of its particles, called /.///;^^ by the pot 



ters 



well as by the prefTure of the atmofph 



water 

 Add to this, th 



fo 



hales, and leaves vacuities between its particles. 



the coafts of Africa, where frofl is unknown, the fertility of 



is much fuperior to our own. 



In refpea to the commonly fuppofed falubrity of frofty feafons to 

 mankind, and to other animals, the bills of mortality are an evidence 

 in the negative in refped to mankind, as in long froas many weakly 

 and old people perifli from debility, occafioned by the diminifhed heat 

 not being fufficient to excite into adion their velTels previoufly too 

 inirritable ; and many birds, and other wild animals, and tender vege- 

 tables, perifli benumbed by the degree and continuance of the cold. 

 It (hould however be obfervcd, as frofty air is alway dry, except 

 when frozen mifts diffolve, as they adhere to the warmer (kins of ani- 

 mals, that it does not generally afFed us with fo great a fenfation of 

 cold as when air near the freezing point is loaded with moifture ; as 



the moifture of fuch 



perpetually evaporatin 



from our ik 



^ 



and produces on them a degree of cold greater than the fimple con- 

 tad of dry air produces, when it is but a little beneath the freezing 



point 



Hence frofty air is more agreeable to thofe young or ftron 



people, who can keep themfelves warm by exercife ; that is, wh 



generate heat by incrcafed fecretion 

 frofts deftroy the old and infirm, wh 



B 



fevere and 



ued 



fe much exertion ; 



nd the children of the poor, who want both food, fi 



and cloth 



ing, in this harfli climate 



It may neverthelefs be true,. that fnows of long duration in our win 

 rs may be lefs injurious to vegetation than great rains and (horte 



carry down many thoufand pound 



Becaufe great 



rains 



frofts. I . 



worth of the beft manure into the fea ; whereas fnow diflblves g 



3 



dually, the upper furface, as it thaws, Aid 



D 



the 



nd 



R 



2 



• part, 

 which 



