734 NATURAL HISTORY MISCELLANY. 
His first collection, made Aug. 11, developed in a few weeks 
sphores, mycelium, and spores of fungi in great abundance. Other 
collections of the same date have as yet developed but little 
life. He had found that in these experiments no animal life 
was developed. 
Mr. Greenleaf showed a slide with a small hole drilled in the 
centre. By resting the slide on the edge of a shallow tray con- 
taining water, so that the hole shall be below the water level, 
we have a self-supplying water cell, which is completed by placing 
a thin glass cover over the hole. i 
Mr. Stodder said, ‘Dr. Woodward has, I think, carried micro- 
photography to greater perfection than any one else. I have here 
several photographs of great beauty, delicacy and accuracy, taken 
with high powers and of very difficult objects.” He then showed 
the following: Amhipleura pellucida, with Powell and Lealand’s so 
called +g, a Tolles’ 7% and qy and another ;1,, and Powell and Lea- 
land’s $, and with a Tolles’ 4, all immersion lenses, and all magni- 
fied to nearly 1000 diam. Also positives on glass of the same ob- 
jects with Tolles’ {920 diam. with eye-piece and 256 without. All 
these show the transverse strize distinctly. Also Stawroneis Stod- 
deri Greenleaf 1000 diam. and 3750 diam. and S. Baileyi with 
Powell and Lealand’s 3 — 3000 diam. 
Mr. Bicknell spoke of the difficulty of using the microscope 
vertically, a position which is often necessary in such work as ob- 
serving living animals in fluid, picking out Foraminifere from 
sand, etc. He had obviated this difficulty by using an ordinary 
Nachét camera lucida. By placing the camera on the eye-piece in 
the usual manner, and looking into the underside of the camera, 
at an angle of about 30° from the horizontal, a perfect view of the 
objects on the stage of the microscope is obtained. The position 
is thus very easy and entirely free from the usual constraint at- 
tending the use of the microscope when in a vertical position. — 
Mr. Bicknell also exhibited an achromatic condenser, made in 
the form of an eye-piece. Dr. Beale in “ How to work with the 
Microscope” has recommended the use of the Kellner eye-piece as 
a condenser, and says “ by stopping off the greater part of the 
light passing through the condenser, by placing over the upper 
lens a thin plate with a very small central hole, a great advantage 
results in working with high powers.” In the condenser shown by 
Mr. Bicknell the amount and direction of the light is controlled 
