Science-gossip . d other animals. In flies whichdeposit their eggs, but do not feed upon decom-posing and often diseased animal matter, the fluidwould entomb any disease germs taken up by theirfeet. This, of course, is supposing that the fluidhardens on exposure to the air, like the fluidemitted by the spinnerets of spiders and the larvaeof some Lepidoptera. I do not wish to imply thatflies do not in any case disseminate disease , I believe, is commonly done when they feedon fluids containing such germs. Hilara pilosa. Longitudinal Sections of the Tarsus?of the Male (fig. 2).—In the
Science-gossip . d other animals. In flies whichdeposit their eggs, but do not feed upon decom-posing and often diseased animal matter, the fluidwould entomb any disease germs taken up by theirfeet. This, of course, is supposing that the fluidhardens on exposure to the air, like the fluidemitted by the spinnerets of spiders and the larvaeof some Lepidoptera. I do not wish to imply thatflies do not in any case disseminate disease , I believe, is commonly done when they feedon fluids containing such germs. Hilara pilosa. Longitudinal Sections of the Tarsus?of the Male (fig. 2).—In the male insect the firstJoint of the tarsus is greatly enlarged. In section,the most prominent feature is the numerous largeglands with their ducts ; the apodeme, the nerve,and tracheae are also shown, whilst no muscle isvisible. The ducts penetrate the inner wall of thejoint, and the outlet can be seen in one of the sec-tions immediatelybehind a large hair. The pur-pose of the secretion from these glands in all. Fig. 2. First Joixt of Taiiscs of Hilara pilosa. ^probability is the same as those in water-beetles,where the glands have their outlets in both thelarge and small discs on the anterior feet. Sections of Head of Blow-fly (figs. 3 and I).—These commence with the first section at the backof the head and continue the series. From of loose embryonic cells seen in the sectionsit is evident that this fly had recently emergedfrom the pupa-case. On one slide there arenumerous sections of the brain and optic tract;-and as they are fairly thin, about J^ mm., most ofthe recent discoveries may be compared withthem. M. N. Newton, Mag: Nat. Hist., 1879,p. 397, states that in the cerebroid or supra-• oesophageal ganglia are situated the organs ofthe perception of memory, of intelligence, they have a more complicated histolo icalstructure than the suboesophageal ganglia, whichprincipally govern the appendages of the nerve-centres are nevertheless con
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