EXTRACTS FROM EXCHANGES. 
935 
is down, which is buckled around each hind leg just above 
ankle joint, which holds hind legs in flexed position and secure. 
D shows English wrought iron, double-tongue roller buckles. 
This device is unexcelled for safely securing a horse for any 
operation. Two men can lay (not throw) a horse down with¬ 
in the area of a blanket. 
No rope to wear out, as wear comes on chain ; no ropes to tie. 
Weight of rig complete, 20 lbs. 
The second drawing shows chain and lock device. Chain runs 
from 1 to 2, from 2 to hind hobble, from hind hobble to front 
hobble, thence to 3. The lock device allows the passage of 
chain but one way (outward). When ready to let horse up all 
is done by running screw back, which is completed by chain 
passing from 1 to 2, from 2 through hobbles, which are made 
on the English style, thereby allowing hobble to drop to floor. 
EXTRACTS FROM EXCHANGES. 
GERMAN REVIEW. 
By Adoi.ph Eichhorn, D.V.S., New York City. 
Researches on the Histology of Tubercles, and the 
Curative Action of Tuberculin \A. Broden\. — These in¬ 
vestigations extend to the histological development of the 
tubercles, and the combatting of the organism against the 
bacilli, in animals which were treated with tuberculin. A 
great number of such prominent histologists as Baumgarten, 
Zeigler, Klebs, and others, conclude that the formation of 
tubercles arises from the connective tissue, while Hiss, Metsch- 
nikoff, and others, see their development from lymphatic 
cells. The author found as very suitable tissue for the investi¬ 
gations the mesentery of guinea-pigs, dogs and goats. Strong 
cultures of the tubercle bacilli, which originated in man, were 
injected intraperitoneally in dogs. In these animals the first 
thing noticed was an exudate, with exclusive leucocytes, hav¬ 
ing polymorphous nuclei, and with a lively amoeboid move¬ 
ment. Depending on the concentration of the inoculated cul¬ 
tures, free bacilli cannot be found between the second and 
fourth day. The great majority of them are inclosed by the 
leucocytes, while the smaller part are in the immobile elements. 
After a few days the leucocytes inclosing the bacilli disappear, 
