208 THE MICROSCOPICAL NEWS. 
Section IIL, entitled “ Popular Microscopical Studies,” is an- 
nounced to be conducted somewhat after the fashion of Vol.’I. 
already published. Each number will contain a description of the 
object issued, a lithographed plate, and the methods of its prepara- 
tion for microscopical study. We strongly recommend those who 
employ the microscope for intellectual amusement, to subscribe to 
this section, as it will certainly contain a series of the most beauti- 
ful objects for the microscope, and the letterpress will help the 
student to understand how to prepare kindred specimens. 
Sections IV. and V., on “ fathological Histology, and Micros- 
copical Petrography,” we are sorry to say, will not be published, until 
the lists of subscribers can be completed ; but we are glad to learn 
that they are rapidly being filled. 
In extension of this notice we refer our readers to the Editor, 
from whom they may obtain a prospectus with full lists of prepara- 
tions to be issued, ete. 
AYLWARD’S CAMERA Lucipa.—Mr. H. P. Aylward of Manches- 
ter is selling a very cheap camera lucida, which can be used with 
the eye-pieces of any maker, without requiring an adapter. The 
reflecting surface is a thin cover glass, which is made adjustable, 
in order that the instrument may be used with either deep or shal- 
low eye-pieces. 
HoMocENEOuS IMMERSION LENSES.—A correspondent who has 
had considerable experience with these lenses writes :—‘I don’t 
know what cement Moller uses, but I have had his slides under 
cedar oil a good deal, and see no signs of deterioration. A friend 
has mounted a good many slides of bacteria with Hollis’ glue, 
which appears to be quite proof against the oil. Ward’s brown 
cement seems equally efficacious.” 
BirRMINGHAM MicroscoPicaL Society.—£xcursion to Oban.— 
The party will leave New Street Station at 10-30 p.m., on Friday, 
29th June, by Pullman Sleeping Car, va the Midland Rail- 
way, arriving at Greenock at 8-30 next morning. ‘Thence they 
will proceed by David McBrayne’s new royal mail steamer Columba 
through the Kyles of Bute and Loch Fyne; thence by the Crinan 
Canal and ocean steamer to Oban. Breakfast will be served 
on board the Columba immediately on the arrival of the party 
at Greenock. It is expected to reach Oban about 5 p.m. on 
Saturday. 
Arrangements have been made for the reception of the party at 
the Great Western Hotel, at Oban, which is of first-class reputa- 
tion, while its contiguity to the sea-beach will be an advantage to 
the members, and will save time for excursions, &c. 
The screw steam yacht Aerolife, of about sixty tons, has been 
