36 Messrs Purvis cmcl Warwick, The Influence of 
speculation did not proceed very far : some cells formed perfect 
spores, and those which did not develope spores, appeared to 
degenerate. 
(4) The cells developed in the blue and violet light appeared 
to show only very faint indications at the end of 29 hours ; these 
indications disappeared later and the cells appeared to disintegrate. 
In the following third series of observations, the gypsum 
blocks were seeded with pure cultures of Hansen’s S. Gerevisice I., 
S. Ellipsoideus II., and S. Pastorianus II., and the following notes 
describe the results. 
27 February. 
11 a.m. The gypsum blocks were seeded. 
28 February. 
10.30 a.m. Red light. Ellipsoideus shewed no indications of sporu- 
lation, except in one or two cells ; Cerevisise shewed very 
faint indications ; Pastorianus shewed no indications, 
except one or two cells. 
Green light. No indications in Pastorianus and Ellipsoideus ; 
very faint ones in Cerevisise, very similar to the red and 
no light. 
Blue light. No indications at all in any of the three species. 
White light. No indications in any of the species. 
No light. Ellipsoideus and Cerevisise as in red. 
3.30 p.m. Red light. Very faint indications in Ellipsoideus and 
Pastorianus ; and some advance in Cerevisise. 
Green light. Very faint indications in Ellipsoideus and 
slightly less than in red and no light. 
Blue light. Indications as in white light. 
White light. Doubtful indications in Cerevisise and Ellip- 
soideus ; no indications in Pastorianus. 
No light. Indications exactly as in the red. 
10 p.m. Red light. Slight advance in the sporulation of Ellipsoideus 
and Cerevisise ; and very slight in Pastorianus. 
Green light. Ellipsoideus shewed indications as in red and 
no light ; Cerevisise and Pastorianus were less advanced. 
Blue light. No apparent advance, and cells were empty 
looking. 
White light. Discarded through an accident. 
No light. Indications very similar to those in the red. 
The third series was not continued further as it was found on 
the morning of March 1st that the lamp was extinguished. It 
had probably gone out early in the preceding night. But 
the general results confirm the previous observations, although 
the distinctions which are not so well marked, were doubtless 
