446 INDEX. 
Experiments on the heat that feeds and plants can — 
fupport - - - Page 36 
Eggs and feeds can fupport more than animals and 
plants - - - Bs - 39 
Reatons for it - - . - 40 — 
Animals fupporting extraordinary heat | - 44. 
Various temperatures in the world - oh, hag 
Fifhes in water at 187° - + 49 
The exiftence of animalcula is regulated bythe known =, 
and ordinary laws of Nature =o Se 
Experiments with cold on animalcula - ae 
Some fpecies furvive 19° below freezing ai valeur 56 
Their germs are not deftroyed by—2° catia 57 
Infects die at various degrees of cold 1 OSE 58 
Their eggs are not deftroyed by—22° - 60. 
Reafons why cold is lefs injurious to germs and eggs ~ 
‘than to animalcula and infeéts - = “Ou 
Reflections on animalcula originating at freezing 62" 
Boerhaave’s opinion concerning the heat and cold that ’ j 
«* animals may fupport, is ill founded — - 66— 
Exceflive cold of different climates ne ssltaent Sa 
‘Phe pernicious effe@ of cold on men arifes from their 
mode of life - “ . on 
Quadrupeds are in general reftricted to certain climates 72. 
Experiments on fifhes with heat - 3 
Torpor - -— - : 76. 
Torpidity of birds - ae Oh 
Fifhes perhaps become torpid - : spa cetin|: 84 
