1881. ] the Peach Tree affected with the “ Yellows,” 851 
rapidly and throw out these wire-like shoots. This symptom, 
with the one previous, are sure and infallible guides to the detec- 
tion of the yellows; they often occur together, but more often 
the former is the second stage, only appearing after the latter has 
been present the year previous. I examined carefully several 
specimens of these branchlets, and in two-thirds of them I found 
the mycelium of a fungus in the tissue. Those in which the 
fungus was present were from South Haven, the remainder from 
other localities showed no signs of mycelial growth. It is very 
probable, however, had time permitted extended sectional exam- 
inations, that I should have found, even in these, evidences of 
parasitical forms. 
4. Microscopical Symptoms.—There are many marked peculiari- 
ties noticed when sections of the different parts of a tree are 
studied, but whether or not some of these will be produced by 
other causes than the yellows, is a subject too patent to need any 
discussion. One of the most important points noticed in micro- 
Scopical examination, is the /oose character of the cells and other 
parts of the section, both transverse and longitudinal. This 
would only be noticed by one who has carefully compared both 
Sections of the healthy and unhealthy tree. I was very much 
Surprised when I first noticed this condition of things, and hoping 
that it might give me some clue to the cause of the disease, I 
examined several more specimens, but with no important results, 
€xcept that it was a constant character of the diseased specimens 
that I had; it appeared in sections of the root as well as in those 
of the aérial portions. Attention may be called also to the 
sheets of mycelia that are sometimes found between the layers of 
wood as probably another symptom. Some of the many investi- 
gators who attribute the yellows to a fungoid growth, consider 
this as very marked evidence of the yellows, but it is not near so 
marked as is the abnormal coloring matter noticed in the pith. 
In the specimens of the wood of diseased trees that I have been 
permitted to examine, the most prominent microscopical symptom 
was the decided separation of the annual growths of wood; in 
the space thus formed no structure was visible, although appar- 
€ntly filled with some material, perhaps the ends of mycelia. I 
found it quite difficult to make sections of the diseased limbs and 
other parts of the aérial portions of diseased trees, for, on account 
of this loose structure, the cells, especially of the bark, were 
