120 MICROSCOPY. 
tissues of the frog’s tadpole’s tail, with special reference to the 
distribution of the nerves, and relates his method of preparing 
the tissues in the ‘* Monthly Microscopical Journal.” Beautiful re- 
sults were obtained by placing the tadpoles for about five minutes 
in a mixture of three drams of chromic acid solution (one-fourth 
per cent.) and twenty drops of sweet spirits of nitre; then wasl- 
ing repeatedly in pure water, immersing for about three minutes 
in ammoniated water (four drops strong liquor ammonica to three 
drams of water), washing off the epithelium in pure water with a 
camel’s hair pencil and rewashing repeatedly in pure water; then 
staining for about five minutes in tincture of logwood diluted 
with pure water to a sherry color, or in a purple aniline solution, 
and finally mounted in a nearly saturated solution of acetate of 
potash slightly acidulated with acetic acid. After staining with 
logwood an improved result was obtained by washing in the usual 
iron developer with acetic acid employed for developing photo- 
graphic negatives. Glycerine was tried as the mounting medium, 
but seemed inferior to the acetate of potash. 
Prepartnc PALATES or MorLusks.— The plan of preparing these 
palates by boiling in liquor potassce, instead of by dissection, pro- 
posed by Mr. Hennah and published eight years ago in the “‘ Intel- 
lectual Observer” has recently been inadvertently claimed as a 
novel American idea. 
Mountine Enromostrraca.— Mr. O. S. Westcott, after experi- 
menting with various substances, has concluded that a carbolic 
acid solution, exceedingly dilute is the best mounting medium for 
the preservation of these minute animals. 
Tue Horse Disease.—I have recently made a series of micro- 
scopical examinations of the matter from the nostril of a horse 
suffering with the epizootic influenza now so generally prevailing. 
A power of seven hundred, with Beck’s 1 inch objective, was used 
in making the observations, and in preparing the accomipanying 
drawings. The great mass of the discharge consisted of mucous 
and pus corpuscles, with many epithelial cells: but I find therein 
the spores of three species of cryptogamous plants. The spores 
are all of a brown color, and occur to the extent of thousands in a 
single drop. One kind, figure 26, are supposed to be spores of 
Urceolaria scruposa a species of lichen: these were in every stage 
= of development, there being hundreds of the fragments of the stem 
