184 MICROSCOPY. 
Gallatin (“ Trans. Am. Ethn. Soc.,” vol. i, p. 97), believed in the 
destruction of the world four times by various causes, on each 
occasion of which the’sun also perished, so that the present is the 
fifth sun. 
MICROSCOPY. 
GASES AND VAPORS IN Micro-cuemistry.— Mr. E. Ray Lan- 
kester describes in the “ Quarterly Journal of Microscopical Sci- 
ence” his gas-chamber, which is a modification of the one used by 
Schweigger-Seidel. A watch-glass-shaped piece of glass has its 
edges ground and cemented to a flat plate of glass. The top of 
the dome thus formed is ground away so as to make a large open- 
ing into its cavity, and closed by a thin cover glass which bears — 
the object to be examined upon its under surface and therefore 
inside of the cavity of the dome. This covering glass is held in 
position, and the joint rendered air-tight, by means of oil. ine 
the top and sides of the dome are inserted glass tubes, three m 
number, through which re-agents, in the form of gas or vapor, are 
introduced into the dome by means of suction or of pressure. To 
prevent too rapid drying of the object, as a dro 
may in some cases be previously passed throug 
Wolff’s bottle. Heat may be applied by introducing va 
a stout copper wire through one of the tubes, and heating the em” 
which remains outside, or by similarly introducing & pantai | 
connected with the poles of a galvanic battery. In this manner 
if desired. 
ochlorie acid 8 
_ drogen sulphide, chlorine, iodine, bromine, ammonia, 
chloroform, carbon bisulphide and carbolic acid. 
stream which might displace the particles un a 
the action of diluents (as water or alcohol) is avoided, a 
minute traces of the re-agent may be introduced, increased, 
or counteracted with great facility. The author peliev™ i 
chemical histology all re-agents should be applied m yet 
form, though not exclusively so, if possible. 
MICROPAOTOGRAPRY. — A good popular article on this poe 
published by Mr. Charles Stodder in the “Boston 1 
