lected light.

Nacreous: Translucent, greyish-white, with pearly lustre.

Sebaceous: Translucent, yellowish or greyish-white.

Butyrous: Translucent and yellow.

Ceraceous: Translucent and wax-coloured.

Opaque.

Cretaceous: Opaque and white, chalky.

Dull: Without lustre.

Glistening: Shining.

Fluorescent.

Iridescent.

2. _Chromogenicity_:

Colour of pigment.

Pigment restricted to colonies.

Pigment restricted to medium surrounding colonies.

Pigment present in colonies and in medium.

~Streak or Smear Cultures.~--

_Gelatine and Agar._--Note general points as indicated under plate
cultivations.

_Inspissated Blood-serum._--Note the presence or absence of liquefaction
of the medium. (The presence of condensation water at the bottom of the
tube must not be confounded with liquefaction of the medium.)

_All Oblique Tube Cultures._--

1. Colonies Discrete: Size, shape, etc., as for plate cultivations
(_vide_ page 261).

2. Colonies Confluent: Surface elevation and character of edge, as for
plate cultivations (_vide_ page 263).

Chromogenicity: As for plate cultures.

~Gelatine Stab Cultures.~--

(A) _Surface Growth._--As for individual colonies in plate cultures
(_vide_ page 261).

[Illustration: FIG. 150.--Stab cultivations--types of growth: a,
Filiform; b, beaded; c, echinate; d, villous; e, arborescent.]

(B) _Line of Puncture._--

Filiform: Uniform growth, without special characters (Fig. 150, a).

Nodose: Consisting of closely aggregated colonies.

Beaded: Consisting of loosely placed or disjointed colonies (Fig. 150,
b).

Papillate: Beset with papillate extensions.

Echinate: Beset with acicular extensions (Fig. 150, c).

Villous: Beset with short, undivided, hair-like extensions (Fig. 150,
d).

Plumose: A delicate feathery growth.

[Illustration: FIG. 151.--Stab cultivations--types of growth: f,
Crateriform; g, saccate; h, infundibuliform; j, napiform; k,
fusiform; l, stratiform.]

Arborescent: Branched or tree-like, beset with branched hair-like
extensions (Fig. 150, e).

(C) _Area of Liquefaction_ (if present).--

Crateriform: A saucer-shaped liquefaction of the gelatine (Fig. 151,
f).

Saccate: Shape of an elongated sack, tubular cylindrical (Fig. 151,
g).

Infundibuliform: Shape of a funnel, conical (Fig. 151, h).

Napiform: Shape of a turnip (Fig. 151, j).

Fusiform: Outline of a parsnip, narrow at either end, broadest below the
surface (Fig. 1