7 
All fungi found upon leaves are treated with corrosive sub- 
limate. This is done chiefly to preserve the leaves intact, the 
fungi being so small that, with few exceptions, insects would 
hardly do them serious damage. All other fungi, particularly 
the conspicuous forms known as mushrooms, bracket fungi, etc., 
are placed in boxes with naphthalene flake for several wccls or 
After a box collection has been once cleared of pests, it is not so 
difficult to keep them out, with a fair amount of precaution and 
vigilance. 
At Kew Gardens, fungus specimens are treated once a year 
with carbolic acid (or a cheaper substitute) and alcohol. This 
mixture is easily applied with a brush to the large number of - 
specimens there that are pasted flat on the sheets without packets. 
Dr. Magnus, of Berlin University, advocates the carbon bi- 
sulfid treatment once a year, in case there is not sufficient time 
for separate treatment of specimens with corrosive sublimate, 
which latter he considers superior. Dr, Magnus works almost 
entirely with rusts and other minute fungi that attack the leaves 
of plants. 
Dr. Patouillard, of Paris, uses corrosive sublimate exclusively 
for all groups of fungi, simply immersing the specimens in a mix- 
ture of sublimate and alcohol. He is of the opinion that this is 
the only practical method of preserving them. He says that 
naphthalene is very good at first, but that when it evaporates the 
insects return. This might not be possible if his specimens were 
in close-fitting box 
Mr. Hennings, a hie Berlin Botanical Garden, uses corrosive 
euelinete also, having no faith in naphthalene. 
esadola, of Trient, claims that insects are entirely 
killed or ernie by naphthalene and that this substance is far 
superior to carbon bisulfid, chloroform, strychnine, corrosive sub- 
limate, or carbolic acid. He places fresh specimens of woody 
forms that are infested with insects ina tight box with naphthalene 
for a day or less, then dries them and keeps them in a drawer 
