1889-90.] Dr Griffiths on Researches on Micro-Organisms. 265 
(a) The Air of Lincoln. 
(. Average number of “ colonies ” in three gallons.) 
Place. 
Year 1887. 
Jan. 
Feb. 
Mar. 
Apr. 
May 
June 
July 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
(1) Top of hill 
{near the Cathedral) 
(2) Base of hill, 
( Broadgate ) 
} s 
} 18 
6 
26 
14 
30 
16 
41 
19 
50 
25 
62 
34 
65 
No experi- 
ments made 
in Lincoln. 
30 
59 
28 
57 
12 
19 
4 
17 
(b) The Air of Paris. 
{Average number of <c colonies ” in three gallons). 
Place. 
Situation in 
Paris, &c. 
August 1887. 
(1) Cimetiere du Pere la Chaise ( near tomb of 
Abelard and Helo'ise), .... 
E. 
96 
(2) Boulevard St Germain, .... 
Central 
104 
(3) Forest of Ville d’Avray, .... 
S.W. 
81 
(4) Rue de Rennes, 
Central 
99 
(5) Palais du Trocadero, .... 
W. 
50 
(6) Park of Versailles {near Palace), 
S.W. 
78 
(7) St Cloud {near Palace ruins), . 
S.W. 
82 
(8) Boulevard Voltaire, 
E. 
100 
(9) Cimetiere Montparnasse, .... 
s. 
98 
(10) Cimetiere Montmartre {near tomb of Offen- 
bach ), ...... 
1S T . 
95 
(11) Parc des Buttes Chaumont, 
N.E. 
80 
(c) The Air of London. 
{Average number of “ colonies ” in three gallons) 
Place. 
July 1888. 
August 1888. 
(1) Forest Gate {Essex), ..... 
64 
79 
(2) City {near Bank), ..... 
85 
110 
(3) West End {Piccadilly), .... 
80 
96 
(4) East End {near Mint), .... 
88 
160 
The conclusions to be drawn from this portion of the research are 
the following : — 
