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DESCRIPTION OF PLATES XLIX-LL 
Illustrating Mrs. Thoday’s paper on Cuscuta and its Host. 
The lenses used were Swift’s 3 mm. objective of 1*4 N.A., Zeiss 2 mm. objective of 1*4 N.A.; 
Zeiss oculars x 6, 8, 12, and 18. Unless otherwise specified the preparations were stained by the 
safranin method followed by treatment with London blue. The blue colour in the figures repre¬ 
sents substances staining with London blue. 
PLATE XLIX. 
I. Salvia sp. 
Fig. 1. Young terminal sieve plate in longitudinal section, traversed by fine connecting threads. 
At the upper end of some of them a faint callus change is already discernible, x 500. 
Fig. 2. Terminal sieve plate in which each thread is enclosed in a callus rod, and is situated in 
a minute depression. A number of fairly deep pits are visible in the radial wall; in each pit a group 
of fine callus rods are visible, x 800. 
