EE CENT MICROSCOPY. 
13 
vations and beautiful sketches * will have a permanent value. 
Taking some scales from the jumping spider (Scenicus salticus ), 
and carefully viewing them with high powers, he found their 
edges 44 crenated,” the 44 outer membrane ” smooth, and the 
44 inner membrane,” or that next the creature’s body, 44 puckered 
up into somewhat irregular rows of hackles.” This seemed 
like a hint that the interjection markings of the Padura might 
be due to corrugation. In scales of Polyxenus lagurus he 
found, what was 44 very uncommon,” according to his observa- 
tions, 44 a deposit between the membrane,” and the scale was a 
very solid structure. Most of his endeavours to detect beaded 
deposits led him to think such appearances were only 44 ghosts;” 
and it is well known that false appearances of beading are 
easily produced under certain conditions. Mr. Mclntire’s ac- 
count of his observations and experiments scarcely warrants 
his conclusions, for he admits 44 pigment granules ” in scales 
such as Amalthusia Horsfieldii , figured long since by Mr. De 
la Rue, and in some others. 
Lieut.-Colonel Dr. J.J. Woodward, of the U.S. army, employed 
his well-known skill in photographing Podura and other scales. 
In the April number for 1871 of the 44 Monthly Microscopical 
Journal ” will be found a paper by him, read before the Royal 
Microscopical Society, in which he says : 44 On the coarser De- 
geeria scale (D. domestica ), I had no difficulty in making out 
appearances which, so far as I can gather from Dr. Pigott’s own 
descriptions and the published discussions of his views, are sub- 
stantially the same as those seen and shown by him . . . and even 
on the more minutely marked and difficult Lepidocyrtus scale I 
have been able to develop appearances which seem to be substan- 
tially similar.” Dr. Woodward did not, however, pronounce 
any decided opinion as to real structure ; but since the date of 
this paper he has kindly forwarded to the Royal Microscopical 
Society, and to the writer, photographs of Degeeria domestica 
beautifully exhibiting a beaded appearance. In a communica- 
tion to the Royal Mocroscopical Society, read in May 1871, 
Dr. Woodward speaks of Mr. Joseph Beck having shown and 
left with him a fine Podura slide, showing the note-of-exclama- 
tion marks with remarkable clearness ; 44 but immediately after- 
wards, with the same optical combination and magnifying 
power, without any change in the cover correction, by simply 
rendering the illuminating pencil oblique, and slightly with- 
drawing the objective from its first focal position, he obtained 
a negative which displayed the bead-like or varicose appearance 
of the ribbing more satisfactorily than he had previously been 
able to do.” A photograph of this appearance may be seen at 
the Royal Microscopical Society’s room. 
* See u Monthly Microscopical Journal/’ January 1, 1871, &c. 
