336 
POPULAR SCIENCE REVIEW. 
cions of tlie sweet cake. He accordingly distributed through the house 
pieces of bacon, which were soon swarming with ants. This was repeated 
with the same result for several days, when the ants finally ceased to visit 
the bacon. Pieces of cheese were next tried with the same results, but 
with an undoubted thinning in the multitude of ants. When the cheese no 
longer proved attractive, recollecting the feast on dead flies in the attic, 
dead grasshoppers were supplied from the garden. These again proved too 
much for the ants ; and, after a few days’ trial, neither grasshopper nor any- 
thing else attracted them : they appear to have been thoroughly extermi- 
nated, nor has the house since been infested by them. — ( Proc . Acad. Nat. 
Set. Phil ad., 1877.) 
A Pigeon Living 'ivithout a Brain. — Dr. McQuillen described before the 
American Philosophical Society (Feb. 1, 1878), a case of the extirpation 
of nearly the whole of the cerebrum of a pigeon, operated upon by himself. 
He desired to place on record the fact that the animal not only survived the 
operation twenty-four days, but that it gradually regained its usual powers 
and habits of flight and its ability to feed itself and drink. Only one other 
such case is on record. 
The TurbeUana of the Deep Waters of the Lake of Geneva. — M. Duplessis 
finds that, with two exceptions, all the species of Turbellarian worms from 
the bottom of the Lake of Geneva are also found in the stagnant waters of 
the shores, or in the marshes and small lakes of other parts of the canton, 
but that most of the species have undergone some modifications. Thus 
specimens of the Planarians Dendrocoelum lacteum and fuscum, from the 
deep waters, are generally smaller and lighter in colour than those found in 
shallow water, and have the digestive tube of a rosy tint. The visual 
organs tend to become atrophied ; but one variety of Dendrocoelum lacteum 
has each eye-spot divided into two smaller points, and has been described as 
a distinct species under the name of Planaria quadrioevdata. Microstomum 
lineare, a Rhabdoccelan form, becomes larger, and has the intestine of a pale 
rose colour when living at the bottom of the lake. 
The two exceptions above mentioned are very remarkable ones. While 
the rest of the deep-water Turbellarians all belong to the neighbourhood, 
these two species, which have been named Voi'tex lemani and Mesostomum 
morgiense , but which probably represent new genera, resemble Mediterranean 
types, and the second belongs to a group of Turbellaria hitherto regarded as 
exclusively marine. These two forms, which have been found in one or 
two other European lakes, are among those which descend to the greatest 
depth. 
As analogous phenomena M. Duplessis refers to the occurrence among 
the Crustaceans of the deep fauna of a form related to the marine genus 
Cgthere ; and states that he has himself obtained two species of Arachnida 
(mites), closely related to marine forms. One of these is a Campognatha 
( C. ForeUi) which so nearly resembles a small species found on the shores 
of the Mediterranean, that the two might easily be confounded ; the other 
belongs to a genus hitherto known only from the Mediterranean. These 
facts are exceedingly interesting and important, in connection with other 
observations which seem to prove the survival in the deepest waters of 
many lakes of a residue of the old marine fauna which once occupied them. 
— (Bill. Univ., Arch, des Set ., Oct. 15, 1877). 
