﻿

  THE 
  

  

  LONDON, 
  EDINBURGH, 
  and 
  DUBLIN 
  

  

  PHILOSOPHICAL 
  MAGAZINE 
  

  

  AND 
  

  

  JOURNAL 
  OF 
  SCIENCE. 
  

  

  CONDUCTED 
  BY 
  

  

  JOHN 
  JOLY, 
  M.A. 
  D.Sc. 
  F.R.S. 
  F.G.S. 
  (^ 
  

  

  AND 
  

  

  WILLIAM 
  FRANCIS, 
  F.L.S. 
  

  

  '* 
  Nee 
  aranearutn 
  sane 
  textus 
  ideo 
  melior 
  quia 
  ex 
  se 
  fila 
  gignunt, 
  nee 
  noster 
  

   Tilior 
  quia 
  ex 
  alienis 
  libamus 
  ut 
  apes." 
  Just. 
  Lips. 
  Polii. 
  lib. 
  i. 
  cap. 
  1. 
  Not. 
  

  

  VOL. 
  XVIII.— 
  SIXTH 
  SERIES. 
  

   JULY— 
  DECEMBER 
  1909. 
  

  

  5© 
  a 
  • 
  «-»- 
  «o 
  

  

  LONDON: 
  

   TAYLOR 
  AND 
  FKANCIS, 
  RED 
  LION 
  COURT, 
  FLEET 
  STREET. 
  

  

  SOLD 
  BY 
  SIMPKIN, 
  MARSHALL, 
  UAMILTOK, 
  KENT, 
  AXD 
  CO., 
  ID. 
  

  

  SMITH 
  AND 
  SON, 
  GLASGOW: 
  — 
  HODGES, 
  FIGGIS, 
  AND 
  CO., 
  DUBLIN; 
  

  

  VKUVE 
  J. 
  BOYVEAU, 
  PARIS; 
  — 
  AND 
  ASHER 
  AND 
  CO., 
  RBRMN. 
  

  

  

  0031 
  

  

  