438 
CORRESPONDENCE. 
As known, this great work of Lafosse continued to be the spring 
from which much of the veterinary literature for the fifty years 
succeeding him drew its nourishment, so that we can safely pass 
over all the literature between his time and our own, and turn to 
books which every veterinarian should have in his library. And as 
we have many Germans among us. I will first quote a few words 
from the French translation of Prof. Foil’s “Manuel der Patho- 
logie der Hausthiene,” 3d Ed., by Dereche el Wehenkel, Paris, 
Bruxelles, 1869, Yol. 2, p. 36 ; 4th German Edition, V©1. 2, 37: 
“ On doime a nom a une rnaladie apyretique a rnarche le plus 
souvent chronic, se presentant dans 1’espece chevaline et se mani- 
festant par des troubles de la conscience des sens et des move¬ 
ments.” 
“Die Dummkaller ist cine chronische, fieberlose bis jetzt noch 
als anheilbar zu bezeichneude Gehirn Krankheit des Pferdes die 
sich durch Storungen der sensoriel Functionen in den verschiedeir 
sten Graden kured giebt und immer an dem gesammten symptom- 
complex und dem chronischen Yerlaufe zugleich zu erkennen ist.” 
Gerlach, Haudbuch d. Gerictlichen Tliierheil Kunde, Berlin, 
1872. 
Farther, those who desire to pursue the investigation deeper 
may refer to **Le Dictionnaire deMed. etde Chirurg., etc., Veter- 
inaire,” per Zundel, vol. 2, p. 260 ; “Le Dictionnaire de Med. et de 
Chirurg., etc., Yeterinaire,” per M. M. Bouley, Reynal et al^ 
Tome 10, Paris, 1874, Article “ Immobilite to the works of 
Haubner, Spinola, Fuchs, Xreuzer, and every modern continental 
writer of repute. 
The aetiology of the disease is to be sought in an accumulation 
of fluid in the laterial and other ventricles of the brain, in conse¬ 
quence of anticipatory inflammatory processes, thrombosis, etc. 
(This fact was first discovered by Wolstein, 1738-1802, the most 
noted German veterinarian of his day, student of Lafosse, and the 
real founder of the Pcyal Veterinary Institute of Vienna, although a 
beginning had previously been made by Scotti). This fluid does not 
produce the peculiar phenomena by compression of the brain sub¬ 
stance, as assumed by most authors, but the phenomena and their 
peculiar progressive development are due to the gradual atrophy 
