118 



A NEW GROWING-SLIDE. 



whether any sample put before him contains them both in admix- 

 ture, or whether it is unadulterated. 



EXPLANATION OF PLATE XI. 



Fig. 1. — Portion of Roasted Chicory, showing dotted vessels and cells. 

 ,, 2. — Portion of seed of Roasted Coffee. 

 ,, 3. — Portion of Membrane of CofFee-Berry. 

 ,, 4. — Sample of Coffee adulterated with Chicory. 



H H^ew (5iowi!t(3=^Slibe. 



AT a recent meeting of the Royal Microscopical Society, a 

 new form of growing-slide, — intended for the examination 

 of minute aquatic organisms, — was exhibited and described 

 by the inventor, Mr. T. Charters White, M.R.C.S., F.R.M.S. 

 The ordinary glass sHp need not here be used at all, but the 

 organisms should be at once placed — with a little water — on this 

 Slide, when all that is needed to maintain a constant current 

 through the cell is the insertion of small threads of cotton into 

 openings in its sides. The organism is thus duly nourished, and 

 its normal development not being interfered with can be readily 

 observed at any time from day to day. The annexed drawing and 



Fig. 15- 



description of this useful Slide are taken with the kind permission 



