586 ON THE CAUSES AND SPREAD OF INFLUENZA. 
price of so great a benefit, that you will second, to the best of 
your power, the progress of agricultural improvement. 
Favour then, by every means in your power, the progressive 
movement, impressed by government on all the branches of rural 
economy, and especially that which has for its object the im- 
provement of the principal species of domestic animals, and a 
love of them. 
Let it then be everywhere understood, that the constant care 
and judicious management of the farmer can do much for the 
amelioration of the breeds of cattle. The beauties as well as the 
imperfections of our cattle and sheep are dependent on the ma- 
nagement of the farmer. He has the power of adding to the 
excellencies or the defects of the flock, and this is principally 
effected by judicious crossing. 
Already — thanks to the more precise and the more generally 
expanded notions that are enforced on the mind of the pupil 
with regard to the different species of domestic animals, and 
thanks also to the efforts of government, which encourage so 
powerfully this important branch of rural economy — we begin to 
see, in our marshes and in our hippodromes, animals that recom- 
pense those who breed them. Already the produce of our stables 
and our sheepfolds are the objects of commerce, and offer to a 
more refined species of industry many valuable materials, abun- 
dant and varied. 
Let these considerations inspire in you, more and more, a love 
of that useful art, the early precepts of which have been imbibed 
in this school ; and also produce in you the ambition of possess- 
ing that high esteem and unlimited confidence which society will 
accord to those only who render themselves worthy of it by the 
variety and extent of their professional knowledge and acquire- 
ments. ” 
ON THE CAUSES AND SPREAD OF INFLUENZA. 
By Herr Tetzlaff, V.S., BarenJclau. 
After many years’ close and attentive observation of this dis- 
ease, I am persuaded that it is contagious, and chiefly prevalent 
during the autumns succeeding to cold wet summers, or at times 
when the electricity of the atmosphere causes the formation of 
thick fogs. It rages most in stables where many horses are kept 
together. Young horses, from three to six years old, are more 
liable to its attacks than old ones, but the latter do not wholly 
