192 
since, such as the Turritis glabra , the Ckenop odium hybridum , and the Triti- 
cum pennatum , no longer are to be found there. The Carex microstachyra was 
abundantly found eighteen years since in the environs of Pawlowsk, but has now 
totally disappeared. 
Mr. Weinxnann enumerates the following plants as no longer existing:— Lyno- 
surus cristatus, Ulatine hydrapepa , JBarbula rigida , JFontinelis foliata, Anthoce- 
ros punctatus, and Drabce lutecs. It would be highly interesting, if analagous 
facts are known in this country, that some of our able contributors would favour 
us with their observations on this extraordinary phenomenon. 
3. —Mr. Corda, of Prague, has made some discoveries of animalculse living in 
innumerable societies, near the hot springs of Carlsbad, in Germany: they are all 
of singular and novel forms. The presence of these myriads has often inspired a 
repugnance to invalids drinking the waters : he recognised forty-two new species. 
Mr. Ehrenburg has pursued similar researches, and added eight other well charac- 
terisedspecies, mostly unknown ; he calls them— Navicula striatula (of Purpin), 
N. umbonata, N. hippocampus and striata (these two are also found in the Baltic 
Sea), Trustulea appendiculata (Agarh), Navicula quadricostata , N. arcus , 
Monas violacea . These four last species inhabited the Carlsbad water, and are 
found no where else. 
4. —Mr. P. E. Botta, the travelling Naturalist of the Paris Museum, writes 
from Tor that he will shortly forward to France the collection he has already form¬ 
ed : he is about to explore a portion of Egypt and Arabia, and is now directing his 
steps towards Djidda and Mocalla, where he will embark for the Yemen. The 
information he had acquired respecting these countries, so rich in objects of Natu¬ 
ral History, induce us to hope that he will be able to proceed so far into the inte¬ 
rior as to collect a rich harvest of specimens hitherto but very imperfectly known, 
from the appalling difficulties which attend European travellers in those expedi¬ 
tions. The experience, knowledge, and zeal of this young Naturalist, who has 
already traversed many points of Africa, and completed a voyage round the world, 
render it likely that science will be immensely enriched by his present researches. 
