486 
THE PRINCIPLES OF BOTANY. 
horse. Nor is it comparable with the alteration which 
attends a Glanders diathesis, for in that case there is pro¬ 
duced in each gland a little purulent centre, which is limited 
by the rapid and increasing induration of the surrounding 
cellular tissue, and thus is arrested in its development and 
undergoes caseous change. Lastly, it is not analogous with 
Lymphoma which commences in a mass of gland, acquires 
enormous proportions and extends to the tissues of diffe¬ 
rent parenchymatous organs.” These lesions like those of 
the skin belong specially to the dourine, and we are most 
tempted to compare them with certain lesion resulting from 
syphilis.” 
The author has made some experiments from which he 
arrives at the following results : 
1. That the blood of one of the patients affected with 
dourine when introduced into the system of a healthy mare 
produced no effect. 
2. That the liquid from the mucous plates produced a 
local lesion when introduced into a healthy horse by inocu¬ 
lation. 
o. That coition seemed harmless, though several times 
repeated, between an affected horse and two healthy mares 
when the penis of the male was unaffected. 
4. That coition when the penis of the same stallion bore 
mucous plates transmitted the disease. 
THE PRINCIPLES OF BOTANY. 
By Professor James Buckman, F.G.S., F.L.S., &c. &c. 
(Continued from p. 253.) 
In the several papers which we have written on this 
subject it has been our aim, while explaining a very compre¬ 
hensive system of classification, to point out the economic 
or medicinal value of some of the leading plants of each 
order. 
From the facts that have from month to month been 
brought before our readers we trust it will not be difficult to 
make out how important is the science of botany to all who 
have to advise on the curing or feeding of various kinds of 
animals, seeing that either as food or medicine plants ought 
to be consulted at every turn. 
This is an opinion that .was recognised from very early 
times ; but in the past, as we have so frequently pointed out. 
