84 
PROF. T. CARNELLET, MR. J. S. HALDANE, AND DR. A. M. ANDERSON 
able to draw any very definite conclusions in respect to them. Such results, however, 
as we have obtained are expressed in the following Table. All the works examined 
were engaged in the manufacture of jute and tow, this being the staple trade of 
Dundee. The visits were all made without previous intimation as to the time of our 
visit. 
No. of rooms 
examined. 
Lowest. 
Highest. 
Average. 
No. of persons present . 
8 
6 
500 
157 
Space per person .... 
8 
593 
5485 
1773 
Temperature (°Falir.) 
6 
45 
58 
53 
Carbonic acid. 
8 
4'8 
23-2 
133 
Organic matter. 
8 
53 
36T 
17-4 
Total micro-organisms 
6 
4 
600 
160 
Bacteria . 
6 
4 
' 586 
114 
Moulds. 
6 
0 
600 
125 
A room in one of the mills gave a total of (at least) 260 micro-organisms per litre, 
of which 12 were bacteria and 248 were moulds. The moulds in this case grew very 
rapidly, and finally filled and choked up the tube. They had a very beautiful and 
delicate appearance, like frosted glass, and with a woolly texture. Being much struck 
with the character of this growth, and not having obtained anything similar in any 
other case, we made a second examination of the room five weeks after the first visit. 
The result was the same as before, except that the moulds grew even more rapidly 
and luxuriantly. This time they amounted to at least 586 per litre. The predomi¬ 
nating species of mould appeared to be exactly the same as in the first case, and 
it rapidly overgrew any other moulds or bacteria which appeared in the tube. One of 
the tubes containing these moulds is represented in Plate 6 (fig. 1). 
What the cause was of the prevalence of this mould in the room we could not 
discover at the time. We subsequently learned, however, that about eight months 
previous to our visit the owners of the mill had purchased, and subsequently manu¬ 
factured, a considerable quantity of loose re-dried jute which had been saved from a 
stranded vessel. This may possibly have been the original source of the moulds 
which had come to prevail in the mill. 
Dundee Royal Infirmary. 
We also made an examination of four different wards in the Infirmary. One series 
of observations was made in the afternoon between 4.30 P.M. and 5.5 P.M., and the other 
in the early morning of the following day between 2.40 a.m. and 5.30 a.m. Previous 
intimation had, of course, to he given in this case. The wards are heated by hot 
pipes and fires, and ventilated on the natural system. All the windows (about ten) 
in each of the wards were open about one inch at the time of our visit. The Infirmary 
