20 
SHEEP SCAB. 
Experiments on Sheep — On December 12 six sheep were 
treated with this dip as follows: Two sheep in a mixture of 
one part of dip to 200 parts of water; two sheep in a mixture 
of one part of dip to 400 parts of water; two sheep in a mixture 
of one part of dip to 600 parts of wmter. One of the sheep, dip- 
ped in the strongest preparation, had a large patch of heavy scab 
along the back, wdiile the other had only a very small patch of 
light scab. In each of the w eaker mixtures one sheep was dipped 
having a small but moderately hcav 3 ^ live scab, and one having 
one or twm patches of verj^ light scab. The sheep with heavy 
scab, dipped in the strongest mixture, was not cured, the mites 
continuing both on and about the old scabby spot. The one hav- 
ing ver\^ light scab w as cured. 
The twm sheep dipped in the one to 200 strength w^ere both 
cured. 
The sheep with the heavier scab, dipped in the one to 600 
strength, was not cured, while the one with incipient scab has 
showm no signs of scab since dipping. 
LABORATORY EXPERIMENTS ONLY. 
SULPHO-NAPTHOLEUM. 
This dip was not obtained in time to enable me to do much with it. 
A lock of w’ool containing thirty-seven mites was dipped in this substance, 
diluted 200 times, and at the end of sixteen hours all were dead. Another 
application in one-half the above strength, in which forty-tw^o mites were 
used, resulted in the death of all within the sixteen hours. 
QUIBELI/S DRY DIP. 
Three different lots of mites on w'ool were dipped in the proportions 
recommended on the packages. Sixty-six mites w-ere included in the ex- 
periments. about one-third of wiiich w-ere alive at the end of sixteen hours. 
In one case the mites were examined after sixty-four hours and several 
found active. The indications are that this will not prove a very ef- 
fectual dip. 
CARBOLIC ACID. 
One part to 100 parts of water. One lot of six mites were all dead 
after sixteen hours. One lot of fourteen mites gave nine dead and five 
living after twelve hours. 
One part to 200 of w^ater. A lot of fifteen mites treated in this 
strength all seemed dead at the end of sixteen hours. Another lot of a 
good number, but not counted, wmre about half dead at the end of 
twelve hours. 
One part to 400 parts of Avater. One lot treated, and about half were 
active at the end of sixteen hours. Also used in proportions of 1 to 500. 
1 to 1,000 and 1 to 2,000, but in no case did the treatment seem to kill 
any mites inside of sixteen hours. As carbolic acid is a dangerous sub- 
stance to put animals into, it seems as though it is very doubtful if it can 
be emi)loyed safely in sufficient strength fo kill the mites. 
