t$i Ohfervaiions on Ants. 



tecaufe he geheralifes his obfervations. The following are 

 thofe which he has tranfmitted from Cumana refpefting the 

 famous I'tak de Te\ dc, called commonly the Peak of Teneriff : 

 — " The Peak of Teyde, which rifes to the height of 1904 

 toifes, is an enormous bafaltic mountain that feenis to reft 

 on denfe and fecondary calcareous ftone. The latter is of 

 the fame kind as that found with a great deal of Hint at Cape 

 Non in Africa, at Cadiz, in the Cliannd, in Provence, and 

 on which the bafaltes of Saint- Loup near Agde, and that of 

 Portugal, reft. It is thus feen with what uniformity the 

 globe is conftru6led. The Azores, the Canaries, and the 

 Cape Verd ides, appear to be a continuation of the bafaltic 

 rocks of Lifbon." 



" The waves thus carry with them, and caft on fhore in 

 Africa and Tcneritf, granites, fyeniteS) and granitic mica- 

 ceous fchift, which I have feen at Sainl-Gothard. It is to 

 be fuppofed that the high ridge of Mount Atlas, which ex- 

 tends from the Eaft towards the coafts of Moroccoj confifts 

 of fuch rocks." 



" The bafaltes of which the Peak is conftaifled, is not 

 only bafaltes containmg foliaceous and cryftallifed olivin and 

 volcanic chryfolite, but particularly towards the top there are 

 ftrata of the porphyrofchitfer of \Verner, or of another kind 

 of porphyry with an obfiadian bafe. The porphyroj'ch'icfer is 

 foliated, fonorous, femi-tranfparent at the edges, fras a verv 

 hard green bafe, and contains cryftals of vitreous feld-fpar. 



[To be continued.] 



XIII. Obfervations on Ants, and on the Poifon of theft 

 Infers ; •ufitb fome Hints for dtflroying them, B: 

 M. Amovrzvx jun. jlf. D.* 



Ti 



HE provident ant, which has been fo often quoted as 



an example of forefight and economy, does not, as has been 



believed, ftore up provifion ; it ts only laborious, and colledts, 



indifcriminately, things that are eatable and others that are 



not J the former to iupply it with food for the moment, and 



* From Noiice da h:Jcil£s dc la France rcputii njcnirhcux, 



th« 



