PROCEEDINGS OF THE SOCIETI'. 
245 
Objects Exhibited. 
Objective used. 
Disc placed. 
1 
Low-Power 
Blue ground 
Colour Illumination. 
Section of gill bone of carp . . 
1 in. 
In condenser 
2 
Feather of humming-bird 
55 
carrier. 
55 
3 
Red on blue ground . . 
Transv. sect. Cidaris spine . . 
5 f 
5 * 
4 
Olive-green ground .. 
Human muscle 
5 
Red on olive - green 
Section of saw of saw-fish 
55 
6 
ground. 
Malachite green ground 
Various diatoms (from Bori, 
55 
7 
Red on malachite green 
Hungary) 
Skin of plaice 
55 
8 
ground. 
Violet ground .. 
Hair of rat 
9 
Red ground 
Camphor crystals 
,, 
„ 
30 
Blue on red ground . . 
Fibres of Egyptian cotton 
55 
11 
Green on red ground 
Spiracle of larva 
55 
12 
Red on white ground 
Foi aminifera from Adriatic Sea 
55 
13 
Red and green halves 
Sponge, Geodia , Honduras .. 
55 
14 
on black ground. 
Bluo and red quarters 
Japanese silk fabric : horizon- 
55 
15 
on black ground. 
Green on red ground 
tal threads blue, vertical 
threads red. 
Rotifers 
!, 
»» 
16 
Black ground . . 
Hydrozoid zoophyte showing 
„ 
» 
37 
Composition Met 
Green to red on white 
tentacles fully extended. 
hod Co 1 our Illumination. 
Transv. sect, bone of human 
1/4 in. 
95 
18 
5> >• 
humerus. 
Tape-worm from duck, Cysti- 
.. 
/5 
19 
55 
cercus cypriccinerea. 
Various diatoms 
I 
1/6 in. 
20 
*5 )» 
Marine algse, Plocamium coc- 
55 
55 
21 
Higli-Power 
Red on blue ground . . 
cineum. 
Colour Illumination. 
Saw-fisli spine 
Apoch. 
Focal plane of 
22 
Blue ground 
Teased-out fibres of human 
1/3 in. Zeiss 
1/5 in. Beck 
objective. 
Between two 
23 
Green ground 
muscle. 
Acarus, Oribata gracilis 
(with correc- 
tion collar). 
1 /4 in. Beck 
lowest lenses 
of objective. 
Above objective 
24 
Red on white ground 
Transv. sect, bone of human 
(with correc- 
tion collar). 
1/6 in. Beck 
in focal plane. 
Do. do. 
25 
15 55 
femur. 
Scales of butterfly, Vanessa 
D D Zeiss 
Do. do. 
26 
Double Image 
The red centre of disc 
urticx. 
Colour Illumination. 
Diatoms. Two images are 
A A Zeiss 
Above objective 
27 
has plane parallel 
surfaces ; the green 
circumference is 
prismatic in form. 
! Own Microscope with 
changing illuminator. 
formed of each diatom, the 
red image showing scarcely 
any detail, the green image 
formed almost wholly of 
diffraction fans minus the 
central or dioptric ray, 
showing plenty of detail 
(partly incorrect). 
Group of diatoms. 
in focal plane. 
