ON ISLE OF WIGHT DISEASE IN HIVE BEES — ETIOLOGY. 
751 
yielded four crates of sections and had fifteen pounds of stores left in the hive. The 
owner writes, “ I am pleased to state there are no signs of any trouble.” Seven 
bees were supplied from the stock, and of these five were harbouring Tarsonemus 
at the same date. 
About the middle of October a slight amount of crawling was observed in this 
stock, but weather conditions have prevented further observations. At the end 
of October a sample of bees supplied was found heavily infected. The stock 
continues under observation. 
Notes on Stock Records. 
R. No. 1 .— In about six weeks after the infection was first discovered, but not 
until the incidence of infection had risen to over 89 per cent., did visible signs of the 
presence of the disease appear. 
No. 44. — This stock certainly developed an infection of Tarsonemus within the 
period of 11th April to 26th May, i.e. about six weeks. The examinations showed 
a rapid spread of Tarsonemus within the colony, so that in a little over four months 
from the arrival of the stock the incidence of infection was 97 per cent. And yet 
crawling was never in evidence* until near the end. 
No. 61. — This stock shows a striking parallel to the previous. Within the three 
months from 30th May to 30th August, the infection rose to about 80 per cent., 
and only now did crawling symptoms appear, although meantime the stock had 
visibly declined in numbers. 
No. A. Ch . — Examination of bees from the original apiary in September, which 
were showing suspicious signs, showed that they too were infected with Tarsonemus. 
It appears probable that this stock was infected before leaving the original apiary, 
and from the fact that on 17th July the percentage of infection was so very high 
it would appear that the distribution of Tarsonemus was well established, though 
probably of recent origin. 
Glasgow, I. — This stock was known to have a definite infection on the 8th July, 
which rose at the end of October to 27 per cent., without disease signs appearing. 
This is a case in which the spread of the disease within the stock is progressing 
with relative slowness. 
Glasgow, P .— This is a similar case to the foregoing in that the spread of infection 
has been slow, and in which the ordinary disease symptoms have never appeared. 
No. 62. — Nearly six weeks in an infected apiary elapsed before this clean stock 
was found to be harbouring Tarsonemus. After four and a half months from the 
time the presence of Tarsonemus was first discovered the incidence had increased 
to over 92 per cent., and no disease symptoms have ever been seen and the stock 
appears in a prosperous condition. 
No. 60. — This is a stock which, although found to have Tarsonemus present in 
August, appears to have lost the infection. 
