204 Anatomy of Anhnahi 



preferved any length of time ia pcrfeftion even with the 

 iifual apparatus of a iiafculum, or tui-cafe, no botanical tfa- 

 veller {hould he without a fmall prcfs, fuch as that defcribed 

 in Dr. Withering's Arrangement, v. l. p. ^l. It may be 

 framed fo as to admit of a drawer for receiving the preferved 

 fpecimens ; eilher thin enough to lie under the feet in a pofl:- 

 chaife ; or, as a feat for a third pcrfon is often defirable, it 

 may be contrived to be as high as the feat of the carriage^ 

 with a correlponding cuHiion on the top. 



III. A curjory View of fame of the late Dfcoveries in 



Science. 



c 



[Continued from Page 251.] 

 ANATOMV OF ANIMALS. 



lUVIER has made many rcfearches refpcoling the or* 

 sanifation of infefts, and the manner in which nutrition 

 takes place among tl)em. " I think I am the firll," fays 

 he, " who has diflinguiflied worms into two grand families ; 

 the mokifcae, which have a heart, and a complete fyftem oi: 

 circulation ; and zoophytes, which have neither. I have de- 

 fcribed the heart, and the vafcular fyRem of the principal ge- 

 nera of the molufcEe ; and I have proved that their venous 

 veffels perform at the fame time the funftion of abforbing 

 veflels." He then fliows that infeils have neither a heart 

 nor veflels of circulation. Malpighi obferved in the filk-v/orm 

 a large knotty veflel extending along the whole back, and he 

 believed that this veflel performed the funftions of the heart 

 and aorta, and that the fame organifation exifted in all in- 

 fers. This opinion was adopted by all naturalifls. Cuvier 

 has carefully examined this veflel, as well as the whole or- 

 ganifation of infefts; but he obferved no movement of fluids, 

 or circulation. Almolt the whole body of the infeft is filled 

 with tracheae : from which he concludes that there is no real 

 circulation in thefe animals, and that their nutrition is per- 

 formed by immediate abforption, as is evident in polypes 

 and other zoophytes, which are found immediately below in- 



•fefts in the fcale of organic perfedion. 



He 



