264 REPORTS ON THE STATE OF SCTENCE.—1913. 
carbon-dioxide output, corrections for the amount of carbon-dioxide 
stored within the large space of the calorimeter (175 cubic feet approx. ; 
see below), the plotted curves are practically converted into lines parallel 
to the abscissa—that is to say, the difference apparently existing between 
the first and second hours of cycling disappears. It would seem then, 
as far as these experiments go, that the total transformation of energy 
is the same in the two cases, varying with the amount of mechanical 
work performed alone, and not with the length of time during which 
this performance has been continued. The bearing of this conclusion 
upon the still continuing differences in the measurements of apparent 
total heat-production in the first and second hour has been dealt with by 
Professor Macdonald in the communication already referred to. 
A large number of special experiments (25) have been performed 
to obtain an experimentally-derived method for estimating the precise 
value of these corrections for internal storage of carbon-dioxide, in which 
the experimental subject has been replaced by a measurable source of 
carbon-dioxide production. Such experiments are still in progress, and 
will be described better at a later period; their results are such, how- 
ever, as to promise considerable security in dealing with the storage 
corrections. 
Incidentally the internal volume of the calorimeter has been 
measured, carbon-dioxide gas being injected until a certain definite per- 
centage composition was attained in the well-mixed atmosphere within 
the calorimeter, and the total quantity present then measured as it was 
withdrawn in the air-current. The figure obtained by. this method, 
176 cubic feet, closely coincides with that obtained from measurements 
of the average dimensions of the chamber (174 cubic feet). This coin- 
cidence in the two sets of measurements is naturally accepted as evidence 
of accuracy of the means used for measuring the carbon-dioxide output 
from the calorimeter. 
The Investigation of the Jurassic Flora of Yorkshire.—Report 
of the Committee, consisting of Professor A. C. SrEwarp 
(Chairman), Mr. H. HamsHaw T'Homas (Secretary), Mr. 
HaARrouD WAGER, and Professor F. E. WEIss. 
Tue work of the year has been very satisfactory. The rich plant-beds 
exposed on and near Roseberry Topping have been carefully examined 
and have yielded a large number of interesting forms, several of which 
are new to Yorkshire. These plant-bearing strata are at the base of 
the Estuarine series, and may be probably regarded as Liassic in age 
and older than any of the previously known plant-beds. Among the 
specimens found are many beautifully preserved examples of two 
species of Thinnfeldia, a species of Ptilozamites, a species of 
Hausmannia, and a new conifer. A brief sketch of the flora has been 
given by the Secretary of the Committee in the ‘ Naturalist’ (p. 198, 
1913). The occurrence of the plant-beds in the locality has been studied 
and proves to be very local. Some plant remains have been found 
