PROaEESS OF MICROSCOPICAL SCIENCE. 
207 
Dr. J. Arnold, who has made further researches into the nature of the 
substance uniting the so-called endothelium cells (epithelioid cells). 
For this purpose he has employed a new apparatus by which extremely 
small quantities of colouring matter were injected for long periods 
into the living animal. The materials used were a solution of sulph- 
indigotate of soda, ferrocyanide of potassium, the part afterwards 
being washed with chloride of iron, so as to precipitate prussian blue, 
and thirdly, indian ink. Frogs and guinea-pigs were the animals 
experimented on ; and the blood-vessels, lymph-sacs, peritoneal cavity, 
anterior chamber of the eye, and subcutaneous cellular tissue, were the 
parts into which the fluids were injected. In the case of the vessels, he 
obtained not only a network of coloured lines corresponding to the 
junction of their epithelioid cells, but also similar junction-lines in the 
perivascular sheath, as well as injection of this sheath, and the lymph- 
canalicular system of the neighbouring connective tissue, whence 
some of the fluids used passed into the serous cavities. 
Ciliated Pus-cells. — In a communication made to the * Central- 
blatt ' (June 10) Professor E. Neumann, of Konigsberg, states that if a 
catarrhal condition of the mouth and throat of a frog be established 
by the application of a few drops of a weak solution of osmic acid 
(one-quarter to one-half per cent.), the secretion of the mouth will be 
found to contain, in the course of from twenty-four to forty-eight 
hours, besides numerous slightly browned but otherwise unaltered 
epithelial ciliated cells, cup cells, and, besides amoeboid cells present- 
ing the usual characters of pus-cells, peculiar cells of an intermediate 
kind, wbich resemble the former in having cilia, and the latter in 
their contractility. The ' Lancet ' (July 29) states that the cilia do 
not cover the whole surface, but form a kind of crown, or are com- 
pressed into a brush. They are imbedded directly in the protoplasm 
without the intervention of any basal seam. The cells often rotate 
actively in consequence of the play of the cilia, and then preserve an 
approximatively round form ; but as soon as the cilia cease to play 
they begin to perform amoeboid movements. 
Dr. Bastiarts further Besults. — Besides a paper in the ' Comptes 
Kendus,' which has called out one from Professor Pasteur, who takes 
Dr. Tyndall's side, Dr. Bastian has communicated a long article to 
the Royal Society (June 15) on the subject of Heterogenesis. He 
states among his conclusions that the generally received belief that 
all Bacteria and their germs are killed by exposing them even for a 
minute or two to the temperature of 212° F. (100° C.) has of late been 
strongly reinforced by Professor Tyndall. The fact, therefore, of the 
fermentation of some specimens of boiled acid urine, with the appear- 
ance of swarms of Bacteria, under the influence of the high generating 
temperature of 122° F. (50° C), is inexplicable except upon the 
supposition that fermentation has in these instances been initiated 
without the aid of living germs, and that the organisms first appearing 
in such fluids have been evolved therein. If the author's further 
position,* that Bacteria and their germs are killed in fluids whether 
* ' Proceedings of the Koyal Society,' Nos. 143 and 145. 1873. 
