206 The Botanical Gazette. [July, 
The first investigations on the nature of tendrils of which 
we have any record are those of Palm™ and Moh? published 
within a few weeks ot each other in 1827. 
The descriptions in these works are necessarily very meager; 
the one dealing with the subject from a physiological stand- 
point while the other reasons from the structural characters 
alone. 
In 1858 Prof. Asa Gray published his paper on the move- 
ments of the tendrils of the cucurbitaceous plants 3 which led 
Darwin to undertake a series of observations which he finally 
extended to more than one hundred species, the results of which 
were published in the Journal of the Linnean Society 1865. * 
Hugo de Vries in his ‘‘Zur Mechanik der Bewegung von 
Schlingplanzen”’s deals chiefly with the difference of growth of 
the upper and lower sides of tendrils and the mechanism of 
movement of twining plants. All of these workers were con- 
cerned chiefly with the outward phenomena of movement 
rather than morphological changes and structural condition. 
Contemporaneous with these observers and later, much notable 
work has been done on the organogeny, structure and phys 
iology of tendrils.® : 
To determine the conditions prevailing in the tendril during 
its period of sensitiveness it was thought necessary to study 
*Patm: Ueber das Winden der Ranken. *%Monv: Ueber das Winden der 
Ranken und Schlingpflanzen. 
®Proc. Amer. Acad. of Science and Arts. 
‘Climbing plants. ; 
®Arbeiten des botanischen Institut in Wiirzburg, 1873, Band I. Heft 3. de 
®BRavaIs BROTHERS: Annales Sc. Nat. 2 Sér., 1837.—ST. Hawn ae 
an 
Roy. Soc. Canada, vol 4 ; F 
taktreize; Untersuchun bot. Inst. zu Tiibi 
SELL: Recherches sur la Vrille des Passiflores: Bulletin de la s 
France, 189, 1890.—Masrers: Trans. Linnean Soc., 1878, p. 317 
