366 



by which the wonderful connective-tissue network of the 

 omentum is everywhere covered. 



The apparatus used will be best understood from the 

 accompanying sketch, Avhich has been kindly prepared for us 

 by Mr. Lankester. 



Explanation of the Drawing. 



The skelcli represents Ilartiiack's microscope with the apparatus adapted 

 to it. 



E is a vessel containing boiling Water. ^/, a tube by which water is con- 

 stantly supplied to the vessel E, at such a rate that the supply always 

 exceeds the loss by evaporation, and by the out-flow from the pipe F. 



0, Outlet tube, leading to waste pipe ; consequently the water in i^' always 

 remains at the level indicated by the broken line. 



F, Tube by which water is conveyed to a loop-shaped metal tube {IF) 

 which surrounds the upper part of the objective, for the purpose of keeping 

 it warnij the vulcanite ring R, serving to prevent the heating of the micro- 

 scope tube. From this loop tlie hot water passes by a second tube into the 

 hot water ])late {A), a full description of which will be found in Professor 

 Strieker's 'Histology,' just published by the Sydenham Society: on the 

 plate stands the glass dish B. From the plate the stream passes, as indi- 

 cated by the arrows, to D, and is thence continued to the regulating tube 

 {R T) on the opposite side of the microscope stand, where it terminates in 

 the dropper, the construction of which will be readily understood from the 

 additional sketch (fig. 2). in which it is represented of its actual size. The 

 dropper consists of a glass tube (?'), having an aperture (o) ou one side. Into 

 the upper end of this tube a second {t), drawn out so as to be capillary at its 



