306 
Transactions of the Society. 
flame, passed through a bull’s-eye, a cell * containing a solution 
of ammonio-sulphate of copper, and substage condensers of varying 
foci and apertures. The exceptions were the use of sunlight in photo- 
micrographing two Amphipleurse. 
Incidentally, the improvement gained by cementing the cover-glass 
to the lantern slide proper is shown in the photograph of a promissory 
note. The dammar cement has not held in certain parts where the 
picture is not so bright as in others where the cement has held and 
where, therefore, there are but two, instead of four, reflecting 
surfaces. 
Photomicrographs of Natural Objects. 
In slide 4, a dog’s flea, the details in the non-actinic parts are 
obscure or wanting, because the negative was taken on an ordinary 
gelatino-bromide plate. 
In slide 5, the same object, from a negative on a Carbutt ortho- 
chromatic plate, the details in the yellow portions are clearer ; and in 
the red are now seen details which could not be seen at all in the 
former slide. 
In slide 7 (plate IV. fig. 1) are seen the lance-shaped ends of the 
long hairs of the American “ carpet-hug,” the larva of Anthrenus 
scrophularise, a comparatively recent and not welcome importation 
from this side of the Atlantic. A change in habitat has increased its 
voracity for all kinds of household articles more or less made up of 
fur, wool, or other animal fibres, much to the dread and trouble of 
every housewife in the country of its adoption. Slide 15 (plate IV. 
fig. 2) shows a portion of a cricket’s tongue ; a sharp and flat field 
result with the Wales 1/8-in. photo-objective. Slide 73 (plate IV. 
fig. 3) is a negative of Sphagnum leaves, giving the effect of 
paraboloid illumination. 
Nine slides illustrate a mooted point in Podura scale structure. 
Three slides show broken or folded hairy wings, or skin, from a 
marsh-fly and a caterpillar, with hairs projecting into the adjacent 
clear field from the broken or folded edge, and present an appearance 
(plate IV. fig. 4) similar to that which a broken or folded Podura 
scale might be expected to show were it covered with “ spines,” or 
“ featherlets,” attached at one end and to some extent free at the 
other. Mr. C. Henry Kain, of Philadelphia, has been skilful enough 
and kind enough to break or fold for me several Podura scales, of 
which the following four slides are photomicrographs. In slide 46 
(plate IV. fig. 5) is seen a fragment of a Podura scale, showing the 
edge of a transverse and oblique fracture. Nothing like a spine or 
featherlet projects from the edge, nor are there any portions of spines 
or featherlets free in the adjacent field. On the other hand, the 
* Trans. Boy. Micr. Soc., n.s., xv. (18G7) p. 253 et seq. ; and Monthly Micro- 
scopical Journal, viii. (1872) p. 186. 
