IGNEOUS AND CRYSTALLINE ROCKS. 181 
TASMANIA. 
Two analyses of so-called ‘‘volcanic bombs” or ‘‘buttons” were made by W. F. Hille- 
. brand, record No. 2097, at the request of W. H. Twelvetrees, of Launceston, Tasmania, 
These curious forms of volcanic glass have every appearance of artificiality, but are 
said to be found under such conditions and in so many localities that the idea of their 
human origin is precluded. A paper on the subject by R. H. Walcott may be found 
in Proc. Royal Soc. Victoria, vol. 11, p. 23, 1898. 
A. From Upper Weld tindrift. Almerose. Analysis incomplete because of insufli- 
cient material. Sp. gr., 2.454 at 18.5°. 
B. From Pieman. J. 3.4.8. Sp. gr., 2.428 at 22° 
15619—Bull. 419—10——_13 
