6 
REPORT ON BOTANY, MDCCCXLI : 
consists of parenchyma, and is forced together in the stem by 
means of the growing woody bundles (holz-hiindel) ; and me- 
dullary rays (^prolong emens medullaires) are formed, which 
the author very correctly defines, and not unjustly terms, 
“ isthmes.” The general term ‘‘ hegemon,” for the cellular 
tissue, which accompanies the vascular bundles, and which 
mostly consists of parenchyma — at times, also, however, of 
long, narrow, parenchymatous cells — ^is likewise very proper. 
The third cellular tissue of the author, the “ proxyle,” has 
already received the name of liber. The Greek appellations 
of the author are, however, had enough, — “ Aphrostase” 
means position of foam ; “ hegemon,” a leader ; “ proxyle,” 
anterior wood ; “ adelome,” concealment. The French always 
used to ridicule the technical terms of our learned men as 
proofs of their pedantry ; we might now, I think, justly return 
the compliment. In German, we might term these tissues 
Grund-gewebe (fundamental tissue) ; Begleitendes-gewebe (ac- 
companying tissue) ; and Bast-gewehe (liber tissue.) That the 
author only saw an inorganic matter in the so-termed cam- 
bium, probably was owing to employing too low a magnifying 
power 
With this I beg to combine the announcement of a treatise, 
which struck me very much, and which partially belongs to 
this subject : — ‘‘ Etude Microscopique des Precipites et de leurs 
Metamorphoses appliquee a 1’ explication de divers Pheno- 
menes Physiques et Physiologiques, par P. Harting. V. Bul- 
letin des Sciences Physiques et Naturelles en Neerlande. Ann. 
1840, p. 287, 365.” The author has analyzed a number of 
precipitates, formed mostly with inorganic substances alone, 
very few of them with organic and inorganic substances 
together. The first kind of precipitates, according to our 
author, are the crystalline ; and he asserts, that crystalliza- 
tion is an original act. The second kind are the moleculary. 
Their form cannot he ascertained, because the corners or 
angles, in the small granules, cannot he recognised beyond a 
certain boundary. The granules unite themselves to irregular 
or flocculent masses, and the molecular motion ceases as soon 
as this is effected. The third kind, the membranom preci- 
398 
