Foreign Vegetables. 281 
<c Sun, they found a confiderable Quantity of Manna. 
<c in the Wood. 
7. “ Peopie who are employed in making Coals, 
“ frequently perceive, when they are burning their 
cc Wood, that the Heat of the Fire occafions Manna 
cc to exude from the neighbouring Alb-Trees.” 
The fame Author obferves, that notwithstanding 
Manna is copioufly produced on all Parts of the 
Afh-Tree ufually called Fraxinus , yet on the Ormis 
or wild Afh it is very rarely found any where but 
upon the Trunk and the thicker Branches. Perhaps 
the Reafon of this may be, that the wild Alh, 
growing in rocky, mountainous Places, and barren 
Soils, is of a drier Nature •, wherefore, not contain- 
ing fo large a Stock of Moifture, nor fo much di- 
luted, a fuperfluous Quantity thereof is feldom pro- 
pelled to the Leaves or fmaller Twigs. Befides, 
as this Tree is very rough and knotty, its Juice is 
eafily abforbed between the Bark of the Trunk, and 
larger Ramifications, before it can arrive at their 
Extremities. 
He likewife adds that Manna is colledted from the 
fame Trees every Year, which yield it for thirty or 
forty Years fuccefiively •, infomuch that many Per- 
fons are always found ready to purchafe fuch Trees, 
on Account of their annual Produce of this Com- 
modity. Moreover, there are fome Trees in the 
fame Place, and of the fame Species , whereupon no 
Manna is to be found. 
Laflly, Thefe Obfervations of Altomarus have 
been confirmed by G Gropius in his Nilofcopium , by 
Lobelias and Pena, by Cojl^eus, Coi'nelius Confentinus , 
Paul Boccone , &c. who have relied more upon 
what they have feen themfelves, than upon the 
Authority of others. 
Therefore, we fhall define Manna to be a Sort 
of Gum exuding from different Kinds of Trees, 
at 
