96 



tARTHS. CALCARfeOUS. 21. Humus. 



fimmattJ, 



dadaha* 



ai. HUlViUS. Confiding of carbonate of liiiie, a 

 fmalkr proportion of filica, hydrogen and car- 

 bonic acid gas, and oxyde of iron : formed by 

 the decayed remains of animal and vegetable^ 

 fubilances : light, friable, imbibing but not re- 

 taining water, meagrej rough, humid, of a dull 

 colour: effervefcing with nitric acid, becoming 

 cinereous in a fmaller heat, in a ftronger running 

 into a frothy kind of glafs. Mould, 



Impalpable, greedily imbibing water, hardly effervefcing 

 with nitric acid in its rude ftate, but fenfibly fo when 

 burnt. 



Humus animalis. Sffi. nat, xii. 3. p, 212. «. 14. 



Humus animaiis. Wdll.fyfi. min. i. p. 23. ». 8. a. 



Humus diverforum anim. Crond, ihin. /e£i» 246. 



Found in Churchyards and other places abounding with putrid 

 animal nlatjer, white or cinereous, very light and fertile. 



Brown, in a very fubtile duit. 



Humus vegetabilis. Syft. nat. xii. 3. p. 209. «. i. 

 Found in all inhabited places, principally originating from 

 aniraal manVre and depofttions, fo very fine as when mixed 

 with water to pafs through a coarfe cloth or filtering paper: 

 IE affords the bell and riclieft garden mould. 



Black when moiftened, cinereous when dry. 

 Humus vegetabilis, Syst, nat. xii. 3. p. 209. n» 2. 

 Kumus atra Wall. fpft. min. I. />. 13. /i. 1. 

 Found in all places where there is decayed vegetable matter 

 especially in dry fituations, and produces an excellent foil. 



^auferata^ Sodn parting with itb moiflure, and when dry becoming 



farinaceous. 



Humus vegetabilis, Syfi. nat. xii. 3. /», 209. n, 3. 



Found on Heaths, and produces a poor foil; becaufe its parti- 

 cles are fo minute and impalpable, as in dry feafdns to be 

 blown about by the leaft breatn of wind, 



Aiptna, Brown, with larger particles. 



Hum. vegetab. groff. Sy(l. nat. xii. 3, /. 210. h- 5» 

 Very comaion in Alpine fituations. 



jjervsicens Swelling after having abforbed and retained water fonrf) 

 time. 

 Hu.ij. vegetab. acerof, Syfi, nat* xii. 3. />. 210, n. 4* 



Purali 



ts. 



\ 



