486 QUEENSLAND AGRICULTURAL JOURNAL. [1 Junx, 1902: 
severe form of Texas fever, and one died and the other made a slow recovery. 
From these facts, and the permanently infectious character of the blood of the: 
southern cattle, which has been repeatedly demonstrated, it appeared to the: 
doctor that the organism of Texas fever is in some manner retarded in its 
growth in the blood of immune cattle, either by the production of an anti-toxin 
of insufficient strength to destroy it entirely, or some alteration in the system 
of the cattle about which nothing is known; that is to say, the cause which 
prevents the multiplication of the organism is a modification of its environment, 
and not of its own character, otherwise it would fail to display the power of 
rapid multiplication, which is seen whenever it reaches the blood of a new host 
not previously infected. If an anti-toxin were produced, the doctor reasoned, 
the injection of large quantities of blood or blood serum from immune cattle 
into susceptible cattle would be equivalent to transferring a portion of the. 
immunity of the former to the later. A number of cows were inoculated with 
ten c.u. of blood from a southern cow, and then quantities of serum up to 100, 
300, and 400 c.c. at different times, but nothing was gained from this experi- 
ment. : 
In the course: of carrying out this experiment, however, Dr. Shroeder- 
deducted a fact which it would be well for Queensland cattle-owners to carefully 
note—namely, that the injection of a large quantity of infectious blood causes. 
diseases of no greater severity than the injection of a small quantity. A dose: 
of ten cubic centimetres seems sufficient, but he recommends that that quantity 
should be the minimum dose. With a ten cubic centimetres dose we may feel 
quite certain that an attack of the infection has occurred, even if it was too 
mild to be diagnosed by the ordinary methods within reach of general practice ; 
with a smaller dose an element of uncertainty remains.—Rockhampton Bulletin. 
A HOG RING GATE. 
An easily-made gate or chute for the purpose of ringing pigs is that 
presented in the accompanying diagram. ‘The two centre boards swing free on 
pivots attached to the crosspiece, with the exception of that to which the lever- 
is attached. The work of ringing the animals is facilitated by the construction, 
of a drive of hurdles or any other obstructions narrowing down to the gate. 
Any port in a storm is the adage of the pig when ina Sa and into the 
inviting opening, though limited may be its extent, will go the head of the 
animal, but that is all. Down comes the lever, and piggy is fast. Then the 
operation which elicits such piercing protests follows without trouble to the: 
operator. With such a device properly constructed, the largest hog can be: 
held with ease. 
