600 Vines. — Proteolytic Enzymes in Plants (//). 
modified roots are more generally active than those that 
are modified shoots : for of the three cases in which vigorous 
liquefaction was observed, one only ( Cycas ) is a true root, 
whilst the organs of the other two are of cauline origin ; this 
is certainly true of the tuber of Tamus communis , and I believe 
it is also true of Dioscorea bulbifera. 
Next come the experiments with flowers and fruits, of 
which about sixty are recorded. Of the various parts of the 
flower, the stamens and the pollen proved to be by far the 
most active. Only three experiments were made with pollen 
( Hedychium maximum , Hibiscus speciosus, Cucurbita maxima ), 
and in all three liquefaction was marked. A considerable 
number of fruits was tested, among others the Grape, the 
Orange (epicarp), the Lemon (unripe), the Red Currant, the 
Peach, the Apricot, the Cherry, and the Strawberry, but with 
invariably negative result. 
These are followed by the experiments with seeds. A few 
unripe seeds were investigated, and of these only a small 
number gave positive results, one of them being Phaseolus 
multiflorus . Among a number (22) of ripe seeds, those of 
Sorghum cernuum , Cannabis sativa , Linum usitatissimum 
(especially the seed-coat), and Anagallis arvensis , were found 
to be active. Contrary to what might have been anticipated, 
the authors found that many germinating seeds, whether 
albuminous or exalbuminous, were quite inactive. 
Some observations were also made on parasitic Phanero- 
gams. The presence of a protease was indicated only in 
the haustoria of Orobanche Hederae and of Cuscuta , the other 
parts of these plants apparently containing none of it : nor 
was any trace of it detected in Viscum album or in Loranthus 
europaeus. 
Finally, attention was directed to ‘insectivorous plants.’ 
The results obtained with Drosera were sometimes positive, 
sometimes negative. The investigation of Nepenthes was 
effected by placing pieces of the pitcher upon the gelatine, 
some having the inner and some the outer surface in contact 
with it : in the former case the gelatine was liquefied, but not 
