742 DR JOHN RENNIE, MR PHILIP BRUCE WHITE, AND MISS ELSIE J. HARVEY 
In several other stocks showing the disease in an advanced stage, every bee 
taken over a period extending to weeks, including drones, flying and crawling 
workers, was found on examination to be infected. The hying workers were 
frequently more heavily parasitised than were the bees of the same stock which 
were unable to hy. 
These facts have shown us that “ crawling ” is only one of the phases of the disease 
and that it cannot be dependent exclusively upon the intensity of the infection, as 
shown by numbers of parasites ; it may be incidental, in part at any rate, to a critical 
position of certain of the mites, so that oxygen starvation of groups of fibres of the 
muscles of flight results. Evidence in support of this is brought forward in Mr 
White’s paper which follows, where also other possible factors are considered. 
The following Table summarises the typical results of our examinations of bees 
for the presence of Tarsonemus. H. indicates that the stock from which the bees 
were obtained was showing no indications of disease, and was described by the 
owners as Healthy. 
S. stands for Sick stock, and invariably indicates that the ordinary symptoms of 
Isle of Wight disease known to bee-keepers were present. The figures quoted 
under the heading Tarsonemus indicate the number of bees in which Tarsonemus 
was found. 
Table I. 
Ref. 
No. 
Date. 
Locality. 
Condi- 
tion of 
Stock. 
Numbers 
Examined. 
Tarso- 
nemus. 
Remarks. 
1 
22 May 
Stonehaven 
H. 
12 
2 
Developed the disease subsequently. 
6 
26 „ 
Edinburgh 
H. 
20 
o 
7 
Rubislaw 
H. 
2 
1 
No. 44 in record. 
10 
14 
Aberdeen 
S. . 
13 
11 
Requeened. Reduced to 1 frame, 30th 
October. 
18 
22 
Kintore 
S. 
12 
12 
Crawling marked. 
22 
27 ’’ 
N orthumberland 
s. 
5 
5 
Stock died out. 
37 
4 June 
Copford 
H. 
31 
0 
Infected artificially later. Became 
queenless. Died out subsequently. 
48 
6 ,, 
Shipton 
H. 
3 
0 
57 
8 „ 
Cults 
H. 
12 
2 
Died out from disease and queenlessness. 
55 
9 ,, 
Banchory 
S. 
3 
3 
62 
14 „ 
Kirriemuir 
H. 
9 . 
0 
70 
17 „ 
Huntly 
H. 
5 
5 
Early stage of infection. Disease very 
prevalent in immediate neighbour- 
hood and robbing noticeable. 
74 
17 „ 
Glasgow 
H. 
34 
3 
No disease signs so far (30/12/20). 
75 
18 „ 
Drumlithie 
s. 
6 
6 
A stock dwindling from the disease. 
Minor tracheae were blocked. 
78 
20 „ 
Cawdor 
H. 
30 
0 
(4 stocks.) 
82 
20 „ 
Aboyne 
H. 
6 
6 
Last stock of 6, — 5 of which have 
already died of disease. 
86 
22 „ 
Laurencekirk 
S. 
20 
17 
An ordinary case. 
92 
21 „ 
Dingwall 
H. 
6 
6 
Stock much reduced and in bad condi- 
tion, but no crawling had been seen. 
94 
21 „ 
Aberdour, Fife 
H. 
20 
0 
No record of disease in this apiary. 
