IFvJoh. Nicolai Pechlinii M. D. &c. de AERIS & JLh 
MENTl DEFECTU,& Fit J SUBJ^UIS MediMh.Mom. 
This Author having received out of Sweden a very emmordy 
nary relation about a Man drowned under Ice and revived 
after fixteen hours time , takes thence occafion to difcourfe in this 
Traft in general , how far Jlir and Aliment zx^ neceflary to the 
life of Vegetables and Animals. 
He begins With VegeUbles , and examines the neceffity of Air 
and water to preferve them alive. Where he obferves the ob* 
fcure degree of life in Bulbs and Roots during winter > as alfo the 
caufe of the diftinaion of life m Jmrnhnd Perennial Plants to- 
gether with the hafty Growth of fome Vegetables, 
Proceeding to Animals^ heiviqmrcsjirft into the Life of Inject^ 
and their apparent Death in winter , (which he efteemsnot to be 
without a remainder of the principle of Life^ ) as alfo into the 
Changes of fome of them into Aurelia*s and Butterflyes. Here he 
takes notice, after e^Wi<///g^ of thofe exceeding minute tubes in 
Silk- worms 5 through which the Air pafleth and carrieth on the 
motion of the liquor in their annular fibers. 
i\r<fjcr he explains, how the fame alteration of Life and Death 
holds in Birds (particularly in Swalkm and Storks^) that is found 
in Infefls $ and takes notice of the Swallows immerging themfelves 
under the water on the fides of the Baltick Sea, and remaining 
thereall winter , and reviving again in the Spring, flying about 
upon their being taken up in winter, and brought into a Hot ftove^ 
Thirdl^y he attempts to lliew, why Fillies cannot live long ia 
the open Air 5 ^4r///becaufe the current of the Air is more impe- 
tuous than the nature of Fifiieswill bear; parti/, becaufe the 
Motion of the Air carries off that vifcous moifture which overlays 
their outfide ; prtfy alfo becaufe the motion of their fins ^ by whic?! 
