79 
to the question of Bees pre-arranging for a new home by means of 
pioneer Bees, and stated facts in his own observation and that of 
others tending to confirm the proceeding. 
XVITI.— Gizsard of Larva of Corethra Plumicornis— 
BY T. B. Rossrerer, F.R.M.S. 
DECEMBER, I, 1885. 
Mr. Rosseter read a paper giving the results of two years 
careful observation of, and experiments on, the structure and 
functions of the Gizzard of Larve of Corethra Plumicornis. It was 
illustrated by accurate and artistic drawings. The paper is pub- 
lished in Vol. v., 8. ii. Journ. R. M. Society. 
XIX.— Coceide or Scale Insects—ny G. 8. SaunpERs, AND 
Carr. McDaxin. 
FEBRUARY 4, 1886. 
Mr. Saunders communicated a paper on the above subject 
previously published in ‘‘The Garden” Sept. 17th, 1881. At the 
same time Capt. McDakin exhibited the well known changes of 
colour produced, in solutions of Cochineal (obtained from the scale 
Insect ‘‘ Coccus Cacti,’”’) by acid and alkaline solutions. He also 
bited some unrecorded colour indications in acid and alkaline 
XX.—Filaria— sy T. B. Rossuren, F.R.M.S. 
Marcu 4, 1886. 
Mr. Rosseter exhibited and briefly described a specimen of 
Filaria or Thread Worm, occupying the Abdomen of a Cypris which 
been found in a Well. 
Fats 
XXI.—Stylographs ’s purr and buzz of « Blue-bottle Fly— 
a By EK. W. Rew, M.B. 
- NOVEMBER 4, 1886. 
i» 
The tracings were taken in work pursued at the St. Mary’s 
tal “Biological Laboratory. They were produced by the 
scular action of a Cat’s throat when purring, and by the wing of 
lue Bottle Fly when buzzing. Diagrams were used to explain 
methods of obtaining the time-tracing, and that of the vibration . 
nd in relation to each other. The Cat’s purr gave 29 vibra- 
per second. Helmsholtz states the lowest C. of the pianoforte 
per second, and the lowest rate of vibration perceptible as 
