^^•v. 



3. 



Its 



' ^lood i 



4. 



m 



. apparent 



omeh 



•bfor 



ave 



Ptioii 



blood. 



utth 



ex- 

 eac- 



a cava of 

 <^eals and 

 r alone of 

 th c caplj. 



the body. 



formed in 

 folely by 

 perplexed 



lices in ve- 

 Dodies, has 



to the 

 hat 



ince 



in w 



d through 



imagined. 



table 



: vege 



rinnin? ^^ 



and proha; 



tP 



owei" 



e 



ma 



dei« 



rei 



5 of tb« 



( 



vv 



any 

 bich 



^0^^ 



;Sect.Y. 4, 5. 



AND VEIN3. 



65 



during the bleeding feafon, as the fap-jaice from the d 



Severed veffels of the alburnum fupplies a gi 



^ 



than the other parts of the wound can imbibe 



quantity of fluid 



4 



Th 



red particles of blood hav 



faid by Lewenhook and 



oth 



ho have infpefted them in microfcop 



be of the fame 



Hence nature has formed no very fm 



with a general circulation of warm red blood; the moufe and hum- 



D 



ming-bird are perhaps the leaft. When it was neceffary to form th< 

 vefTels much more rhinute, a diluter kind of yellow or milky blood, o 

 one nearly tranfparent, conftitutes the greateft part cf the vital fluid 



as m in 



fed 



f 



kind 



and in the wh 



mufcles of fifh 



whence arofe a difficulty to the anatomift of vifibly injeding thefe 

 fmaller feries of veflels, as they arc too minute to convey almofl any 



red part 



In th 



ble world the finer fyilems of their veffels have flill 



greater tenuity, and hence evade our eyes and microfcopes ; and 



their coats poflTefs at the fame time a greater rigidity, they 



^^ 



ncral on that account alfo incapable of 



coloured inje£l: 



which has rendered the anatomy of plants fo much more difficult to 

 inveftigate than that of animals, and muft apologife for the imperfec- 

 tions of this part of the work, but affords no argument againfl the 

 exiftence of a vegetable circulation. 



It is probable that by immerfing charcoal, nicely made by flow calci- 

 nation, in quickfilver, or even in melted coloured wax, as it fo greedily 

 abforbs almofl: all fluids, when recently taken from the fire, or cooled 

 ■without the conta£l of air, we might produce beautiful vegetable pre- 

 parations, 

 But the column of quickfilver employed to pufti forwards the injed 



and o-ive more accurate light into the anatomy of pi 



hi eh, lefl: 



o 



Ihould 



pture the veffels it ought 



S 



ihould not be too 



only to fill, as I fuppofe has fometimes happened in thus inje6l 



the glands or capillaries of animal bodies. 



5. Recapitulation. We may finally conclude, that the circulat 



K 



& 



of 



