A BOTANICAL PHYSIOLOGIST 
242 
Some further reference to this valuable MS. will be made in 
discussing Hope’s drawings—with which I am chiefly concerned. 
These are some 80 in number, about half being duplicates, and 
are grouped according to subject in folded sheets of drying paper. 
In spite of their small size—the majority are about 10 x 13 
inches—they seem to have been employed in lectures, because 
we find on them such notes as “ Not used, 1785.” Most of them 
seem to have been drawn! from nature in red chalk and carefully 
re-copied in sepia or some dark-coloured water-colour. Why 
they were so reproduced is not evident, since the chalk drawings 
are clearly superior to the copies. 
Fig. 1, Plate xliv., is a good representation of the nyctitropic 
movements of a clover (7. repens). It is certainly drawn from 
nature, and, indeed, Hope could not, as far as I know, have 
found at that time any published figure of a sleeping clover leaf 
to copy from. Clover is not figured in Peter Bremer’s dissertation 
on Somnus Plantarum,? where, moreover, the description of the 
sleep-movements, in this genus, is very imperfect. 
Fig. 2, Plate xliv., is also drawn from life and is probably 
the earliest existing illustration of a sleeping Desmodium. In 
the figure in the Power of Movement tn Plants the fact that the 
little lateral leaflets are not depressed like the terminal one is 
clearly shown.* It seems probable that Hope did not notice 
this ; at any rate it is not made clear in his sketch. 
Fig. 3, Plate xliv., is described as an Acacia, but as Hope 
notes that the upper surfaces of the leaflets meet each other it is 
practically certain that it represents a Casséa. It is difficult to 
understand how Hope could have made this mistake, and it is 
conceivable that the drawing was inscribed “ Acacia” by the artist. 
Moreover, there is in the Amenitates a good figure of a sleeping 
Cassia, from which, however, Hope’s diagram is certainly not 
copied. 4 
The most interesting of Hope’s experiments are those dealing 
with the combined action of light and gravity. Du Hamel made 
* The venti are signed J. Lindsay or J.L. ; some are by Bell, and an coven 
one is signed A.F. 
* Amenitates Academice, vol. iv., 1760, 
i. P+’ 333- 
- 358; the fact that the sihall aii are awake, at any rate during the early 
part of the night, is given at p. 
4 The Cassia soca he 371) in te Poitier of Mibeenene buiy the sane epocied 
as that in the 4m »f Movement is possibly the sa ~ 
* Physique des serena 1758, vol. ii, p. 148, 
