I

• The combustible gases are continuously evolved (or emitted) from the surface.

• Turpentine, the volatile portion of the gum that exudes from incisions in trunks of living pine trees ...

• An exothermic reaction is a reaction of transformation during which heat is liberated.

• Considerable heat is released (or evolved) during the fermentation.

• Adding benzene to such a mixture raises the freezing point and ice separates out.

• These enzymes are secreted by the labial glands.

II

• N = O stretching bands are prominent at 1475 cm[sup]-1[/sup].

• Of the known separation methods, gas chromatography stands out as the most mature in development.

• Certain of these groups of compounds stand out as being much more active than others.

• Two other bright features stand out on the surface of Venus.

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• Carbon monoxide and carbon dioxide are both given off copiously when lunar fines are intensely heated.