Geology and Natural History. 141 
mineralogy, especially its crystallography, was issued in 1870. It 
treats of Olivine, Humite, Cerusite, with additions to the former 
that those of the true rhubarb were round, and with numerous 
agree no better. The medicinal product is derived therefore 
from a species with leaves lobed and palmately nerved, as in & 
Teport of the portion of Thibet, protected by = sao 
ee rocks, whence caravans brought the 
ti € information that it grows toward the west- 
lers of the Celestial Empire. It was only in 186 
bad able to procure plants of the best Thibetian rhubarb ; 
uds were alone saved, thanks to the skill of M. Neum h 
amongst the masa received by the Société d@’Acclimation 1m the 
Worst possible condition. One of these was planted in the garden 
of the Faculty of Medicine, where it has succeeded admirably ; 
