290 Scientific Proceedings, Royal Dublin Society. 
is such as to secure the absorption of the CO,, the air and emanation 
only being transferred to the electroscope. ‘This is a very effective 
method where the attack with acid secures complete solution. 
(D.) The substance in the form of a fine powder is placed in a 
small flask, and acid run in upon it, the remainder of the treat- 
ment being as in method (C). It is, of course, only applicable 
to carbonates, or soluble substances like manganese dioxide, 
calcium sulphate, &e. 
(E.) The substance is enclosed in a very thin blown glass 
bulb, which is sealed by the blowpipe. This is preserved for 
about twenty days. The bulb is then placed in a flask, and after 
this is attached to the train of receiving apparatus, the bulb is 
broken by shaking the flask. Acid is then run in, and the process 
proceeds asin (D). ‘The object here is to correct the loss which 
attends the direct treatment of powders owing to the large surface 
and consequent escape of emanation. ‘This loss is shown in 
experiment (2) on the Globigerina Ooze, from the ‘ Albatross ’ 
collection, when compared with experiment (1) on the same 
material. 
The weights of material used in the several experiments are not 
corrected for contained hygroscopic moisture. ‘lhe substances are 
in every case weighed “air-dry.” 
Biuwe Mud. Chall. Station, 45. Lat. 38° 34’ N., long. 72° 10’ W. 
1240 fathoms. (Off the east coast of N. America.) 
This deposit contains a considerable proportion of small 
rounded pebbles and sand, composed mainly of quartz. 
On 8°86 grams treated acoording to method C. 
Radium per gram in grams 31 x 10". 
Globigerina Ooze (from Mr. Kemp). Lat. 51° 37’ N., long. 12° 5’ 
to 12°14’ W. 557 to 579 fathoms. (Brought up in trawling 
off west coast of Ireland.) 
This Ooze is not quite free from mineral detritus derived 
from the land. 
(1) On 20 grams by method B (soluble part 11 grams). 
Radium in grams per gram of whole quantity 6:0 x 10-™. 
(2) On 10 grams by method A (all in solution). 
Radium in grams per gram 6°6 x 10. 
