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POPULAR SCIENCE REVIEW. 
These cells become stuffed with fatty granules at a later period, 
when the nucleus is lost. 
Fig. 4, 5. Parenchyma of light-organ, consisting of pale, clear cells at the 
surface next the skin, with tracheae penetrating the mass ; here 
and there a fine stroma of delicate fibres is seen. 
„ 6. Diagrammatic section of insect between fourth and fifth abdominal 
segment. The large oval of circles represents the ovary stuffed 
with ova. The central dark circle marks the positions of alimentary 
canal and oviduct. The three smaller ovals indicate the position of 
the median and lateral light-emitting organs. These are imbedded 
in the common interstitial mass of fatty bodies, represented by the 
shading of small circles which fills the whole remaining space of the 
abdomen. Between the middle light-organ and the alimentary 
tube is placed the chain of ventral ganglia and their pairs of nerves. 
At (a), on either side of each abdominal segment, are the openings of 
the tracheae, which penetrate between the loose strings of fatty 
bodies, and are distributed on the several abdominal viscera and 
to the licrht-organs. 
