Unorganized ferments, 183.
"Unsaturated" acids, 132, 138.
Uracil, 161, 162.
Urease, 190.

Valine, 168.
Vanillin, 80, 148.
Vegetable bases, 18, =151=.
Vicianin, 88.
Vicilin, 176.
Vignin, 176.
Vitamines, 239, 240, 242.
Volatile oils, 20, 147.

Water, 3, 21, 22, 23, =224=.
Water-soluble B, 243.
Waxes, 18, 129, =140=.
Weathering, 4.
Wood gum, 68.
Wool fat, 129.
Wound gum, 68, =69=.

Xanthine, =160=.
Xanthone, 82, =83=, 102.
Xanthophyll, 112, =113=, 121.
Xanthopurpurin, 83.
Xanthorhamnin, 52, =84=.
Xylan, =69=.
Xylose, 35, 68, 69.
Xylosides, 56.

Yeast, 61.

Zein, 165, 170, 176, 177.
Zinc, 13.
Zymase, 51, 56, 190, =192=.
Zymogens, =198=.

Transcriber's Notes:

The original spelling and minor inconsistencies in the spelling and
formatting have been maintained.

The following words have been variably hyphenated in the original:
oxy(-)cumarin, tri(-)saccharides, sugar(-)like, mono(-)saccharides,
sea(-)weeds, di(-)sodium, foam(-)like, di(-)basic, aldo(-)hexoses,
chromo(-)proteins, galacto(-)octose, gluco(-)octose, keto(-)hexoses,
ligno(-)celluloses, manno(-)octose, para(-)pectic, di(-)saccharides,
poly(-)saccharides. The variable hyphenation has been retained in this
version.

Formatting:

Text in italics was marked using underscores (_text_) and bold text using
equals (=text=).

The greek characters alpha and beta were marked as [alpha] and [beta]

Triple bonds were marked as [trb] in order to keep the lt1-text. Vertical
double bonds are marked with a broken bar |.

On page 120 the illustration of the decomposition of chlorophyll a and
chlorophyll b could not be displayed due to its complex structure.

On page 147 the incorrect formulas of sitosterol, C_{27}H_{43}OH and
stigmasterol, C_{30}H_{49}OH were not changed due to the fact that the pure
compounds were first isolated in 1926 after this book was published.

The table below lists all corrections applied to the original text.

p 3: Abderhalden's "Biochemische Handlexicon" -> Handlexikon
p 10: with the blood pigment, haematin -> haematin
p 15: special type, or unusual origin. -> [period added]
p 17: that the photo-synthesis -> photosynthesis
p 20: Experiments with algae -> algae
p 21: that when algae -> algae
p 26: Experiments," 294 pages, 49 -> [period deleted]
p 36: acts as a powerful anaesthetic -> anaesthetic
p 40: Die Chemie der Chlorophyll -> Die