Part III.] Raitt : Bamboo as Material for Paper-pul/p. 
31 
36. By the courteous permission of the Editor of Der Papier-Fabri- 
Icant, Berlin, I am enabled to reproduce from that journal two micro¬ 
scopic illustrations and extracts from the report of Dr. Hanausek, the 
well-known technical microscopist of Vienna, upon specimens of bam¬ 
boo ( C . pergracile) and pulp made therefrom, sent to him by myself. 
The illustrations with their descriptive letterpress explain themselves. 
Dr. Hanausek’s report contains the following :— 
“ The microscopic illustrations show two kinds of sclerenchymatous 
fibres, a short one 0 *4 to 0 *6 mm. long and about 0 '009 broad, and a long 
one 1 to 2 mm. in length and about 0 '02 broad. The fibres are spindle 
shaped and smooth, the ends pointed and not furcated (see Plate I, 12- 
13) ; the walls in the short fibres are highly thickened so that only a nar¬ 
row line shaped lumen remains ; in the long fibres the thickening is some¬ 
what less and lumen distinctly visible as a stripe. The sample sent me 
by Mr. Raitt is bleached pure white, whilst formerly bleached bamboo 
has always retained a yellowish tint. On examining this sample under 
the microscope I found fibres which had a special sheath and also knots 
and displacements (Plate I, 1-5 and Plate II, a), and which have in 
general a striking similarity to those of the Japanese paper-mulberry 
(Broussonetia papyrifera). At first I imagined a mistake had been 
made in the description of the sample, but on obtaining from Mr. Raitt 
a sample of the raw bamboo (Cephalostachyum pergracile) I found the 
same kind of fibres in it. The above mentioned sheath has clearly not 
been noticed by botanists heretofore because it was destroyed when 
preparing the fibres. The sheath is present only in the long fibres (Plate 
II, F and a). The smaller fibres (Plate II, /) do not show it; it renders 
it exceedingly difficult to distinguish between Cephalostachyum and 
Broussonetia , because the displacements, cross stripes and formation of 
knots are the same in both fibres. Besides the above mentioned two 
kinds of sclerenchymatous fibres, a third form of long cells occurs which 
possess no appreciable thickening but have slantingly truncated or pointed 
ends (Plate I, 6). These fibres are broader than the sclerenchymatous 
fibres and have one or two rows of oblique pores. These are numerous 
parenchymatous cells, either thin-walled and long (Plate I, 9) or thick- 
walled and short (Plate I, 8). There are no fragments of the epidermis 
in the sample sent me.” 
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