492 : Scientific News. [May 
to this area minus the secondary extension, caused by the pro- 
jecting yelk in the Monotremata.” 
lies between the inner face of the zona pellucida and the ex- 
ternal zona or granulosa-membrane.—Ep. | 
SCIENTIFIC NEWS. 
mencing Wednesday, August 31, 1887, under the presidency of 
the eminent chemist, Sir Henry E. Roscoe. The local commit- 
local committee (38 Barton Arcade, Manchester, England) at an 
early date, so that the necessary arrangements may be made. 
—The American Association for the Advancement of Science 
will meet this year in New York City. The meeting will begin 
August 10 and continue one week. This is the first time that a 
meeting has been held in New York, and a large attendance is 
expected. Arrangements have been made by which the various 
sessions will be held in the buildings of Columbia College. The 
~~ r Entwickelungsgeschichte der Thiere. 4tes Heft, 4to. Wiesbaden, 
