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GLANDS AND 



Sect. VL i. i, 2. 



coaL 3 EJfential oils agreeable. Toijomns. Prejerve wood from infers. Ufed 

 in Africa to foifon weapons and pools of water. 4. Some ejfential oils hurfi into 

 fame with nitric acid. Produce a vapour round di^amnus fraxinella. 5. Elaftic 



re/in. Bird-lime, Reftnous part of wheat -flower. IX. i. Bitter, narcotic, 

 acrid juices, for the defence of plants. Opium exijis in thepoppy-head^ hut not in 

 the feed. So of hyofcyamus. Narcotic matter in walnut-hujks not in the feed. 

 Oil of hitter Mlmonds tajielefs. 2. Acrid^ qflringenty emetic^ cathartic^ and 

 colouring matters. Many poijomus plants in nil ^our hedge-hottoms. 3. All 

 thefe are ftrongejl in the hyhernaculum or winter -lodge of plants. When oaks 

 jjjould he decorticated. X. i. Kcids in fruit and leaves of various kinds. Con- 

 vertible intofugar. For the nutrimmt of feeds andhuds^ For the defence of the 

 plants. 



I. I.. The ftru (flu re of the glands of animals "has not been yet fully 

 afcertalned. They confifl of vefTels fo minute as to exclude all co- 

 loured injeclions, except quickfilver ; and the terminations of thefe 

 veffels are fo tender, that the necefTary weight of the quickfilver is 

 liable to break them, and thus mifinform the obferver, as mentioned 



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in Se£t. V. 4. Little more is therefore known of them than their 



Ah 



effedt, which is, that they fecrete, that is feparate or produce, fome 

 fluid from the blood; as bile, falvia, urine, milk. 



The veflels of vegetables being ftill more minute, and more rigid, 

 the ftrudiure of their glands is ftill further removed from our difco- 



Their effe<5ls are however as evident as thefe of the glands of 



very 



animals in the fecretion or production of various fluids, which be- 

 come folid, as their aqueous parts are abforbed or exhaled, as mucilage, 

 ftarch, oil, fugar, honey, wax, turpentines, eflential oils, aromatics, 

 bitters, narcotics, acrids, acids, and a variety of other materials, 

 which fill our barns and granaries, and crowd the fliops of the drug- 



gift. 



2. There can be no doubt from what has been already faid of the 

 circulation of vegetable juices, but that thdir various fecretions muft 



be effeded in a iimilar manner to that in animal bodies, which is 



Relieved 



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