xii The Illustrations. 



*!<;. PAGE 



25. R. and J. Beck's Ramsden Screw Micrometer - 66 



26. Botterill's Trough 67 



27. Rousselet's Live-cage - - 67 



28. Cole's Microtome, by Watson and Sons 78 



29. The Cathcart Freezing Microtome - - 74 

 80. The Cambridge Scientific Instruction Company's Rocking 



Microtome - - - - - - 76 



ERRATUM. 



Page 30, line 10, for 'page 41 ' read 'page 4f>. ' 



