28 THE MICROSCOPE. Feb. 
alive and fresh it is a very pretty diatom. It is in the 
shape of a wheel without the rim, the huband eight spokes, 
three above, three below and two horizontally extended 
one on each side of the centre. ‘These spokes are orna- 
mented withalternate patches of golden yellow endochrome. 
The Examination of Cloth.—When samples of cloth, 
claimed to be all wool, all silk or all linen are desired to be 
examined, take a piece of one of the threads pick it apart 
with needles, place it on a slide in a drop of water, cover 
and examine. A power equal to a quarter inch objective 
is necessary. The view will be best when too much of the 
material is not examined at once. It will be necessary to 
examine the warp and the woof andthe different threads 
apparent tothe eye. If the examiner is familiar with the 
appearance of the different fibres, frauds and adultera- 
tions will be easily detected. 
The Examination of Objects in Water.—When a 
gathering of water is made it will readily occur to any one 
to examine the sediment but many fail to examine the 
specimens floating on the top. Frequently the objects on 
the surface will be unobserved when viewed directly but 
when held so as to be observed obliquely many little specs 
will often be seen. These specs will frequently be found 
to be the most interesting of the entire gathering. “They 
should be dipped out witha spatula and transferred to a 
shallow cell, and first viewed with a low power. In this 
way may be found small crustaceans, as Daphnia pulex, 
Bosmina and CiliataasAnurea longispina and such diatoms 
as Rhizoselenia. 
SCrENCE-GOSSTP: 
Where to Find Microscopic Material.—Sweepings from 
back yard fences, from cellar walls and out of the way 
places are fruitful fields for microscopical material. We 
can not only find insects, their cocoons and eggs, but many 
