497 
1910-11.] On some Nuclei of Cloudy Condensation. 
any of these numbers by 160932 — that is, by the number of centimetres in 
a mile — we get the number of particles required to jDroduce a complete haze 
of view in a column of air 1 centimetre square, whatever the length of the 
column may be ; it may be 1 mile or 250 miles. A complete haze is one 
that completely hazes out of view a distant hill or other object. 
Table II. 
Place. 
Value of G at different Wet-bulb Depressions. 
o 
4° to 7°. 
7° and over. 
Kingairloch, 1893 . 
77,525 
105,923 
140,628 
„ 1892 . 
No observations 
116,677 
174,832 
Alford .... 
75,474 
95,153 
124,921 
Rigi Kulm 
75,176 
104,430 
124,211 
Mean 
76,058 
105,545 
141,148 
Now, the point to which I wish to direct attention is : Do these sun- 
formed nuclei, which were found in such numbers on the foreshore at 
Appin, affect the number which was found to be required at Kingairloch to 
form a complete haze ? The abnormal numbers were observed at Kingairloch 
in N.W. winds — that is, in pure air, where their presence could be easily 
detected ; but, one naturally asks, are not all the observations at that place 
vitiated by these sun-formed nuclei, because it is surrounded, more or less, 
on all sides by sea lochs and islands, and from the foreshores of these the 
sun-formed nuclei may be brought with winds from every direction ? 
Let us see how Table II. helps to answer this question, namely, Does it 
require more particles at Kingairloch to make a complete haze than at an 
inland place ? In Table II. the values of C for Kingairloch are evidently 
higher than at the Rigi Kulm in Switzerland, or at Alford, situated about 
25 miles from the coast in Aberdeenshire. The figures in Table II. are 
put in a more convenient form for our purpose in Table III. The two 
years’ observations at Kingairloch are averaged, and also the observa- 
tions at the two inland stations. Underneath these figures are given the 
differences ; and it will be seen that the values for C at Kingairloch are 
higher for all conditions of humidity of the air than at the inland places, 
showing that these sun -formed nuclei have entered into all the observations. 
In making up the original tables for calculating the relation between the 
amount of haze and the number of particles at Kingairloch, all the observa- 
tions made in N.W. winds while the sun was shining were rejected, as they 
contained an unknown quantity, since the amount of haze at the time bore 
no relation to the number of particles. The increase in the Kingairloch 
vol. xxxi. 32 
