262 REPORTS FROM THE SECTIONS. 
Mr. Hirst recommended the placing of a piece of ground glass 
he obtains a soft pearly light, very suitable for the display of 
insect preparations, and with the least possible fatigue to the eyes. 
Mr. W. MacDoyne tt, for Mr. H. J. Brown, exhibited and pre- 
sented to the Society’s cabinet a series slides of spicules of 
Synapta, of small Tunicata, and of Gorgonia. : 
Mr. Martin showed Lord Osborne’s area ee the object 
operated upon being Gomphonema constricta, in situ 
Mr. MacDoyvett exhibited some new and rare chest 
diatoms from Peru and California, and Mr. Gilliat Climacosphenia 
australis 
Mr. Pepiey exhibited a rich gathering of Desmidiacee, from 
_ Bondi; and Dr. Morris Méller’s new series diatom typen platte. 
MONDAY, 12 AUGUST, 1878. 
The Rev. George Martin in the Chair. 
The minutes of the previous meeting were read and confirmed. 
ORRIS read a paper upon “ The Incrustation of the Sydney 
Water-main. 
Mr. Hirst exhibited some very thin glass suitable for thecovering 
of micro-objects. This glass is simply blown from ordinary glass 
tubing, is incomparably thinner that the thinnest covering glass, 
and is so elastic that it is easier torn than broken, and may be 
readily cut to any shape with scissors. 
Dr. Tucker exhibited a human fetus six weeks old, and the 
hand and foot of another four months old.. 
Mr. F. B. Kynepoy exhibited a collection of insect preparations ; 
and Mr. H. Paterson showed the partial erystallization of chalk 
subjected to a pressure of about 95lbs. to the square inch for three 
and a half hours, at a temperature of 350° Fahrenheit. 
Mr. Marry exhibited Sertularian zoophites, and crystals of 
santonine, and Mr. Pedley, polyzoa from Port. Jackson. 
MONDAY, 9 SEPTEMBER, 1878. 3 
Mr. H. G. A. Wricur in the Chair. 
a minutes of the previous meeting were read and confirmed. 
en "called the attention of the meeting to a hand- 
croscope of Swift’s make, which had just beem 
imported by the Society for the use of the ilferent Sections. 
h obj ective 
of 100° of with 
Ww. 1 eats 
