tlic sonrcc of liglit. Condcnscr not coiisinl with objcctivc C ~I I S C S glarc and fnlsc iningc.
dl irror.--TIic coiiciivc mirror unsuitable for usc wit.11 tlic condcnscr. Source of Ii.~rllrr.--Al)crrntioii corrcctions of ncliroiiintic conilcnscr rlcpciid oil distilncc of source, via mirror, of about 8 in. Opnl electric bulb n t tliiit distniicc lins too Iiirgc :in illuniinnting nrcn, causing glrirc, which should hc limited, prcfcrnbly by nil iris diaplir;igm, to :in nrcii just sufiicicnt to covcr thc object. Colonr scrccii bcforc tlic iris, or iicutriil glnss to control intensity. Diiigranis showing tlic cones of light producing cithcr glarc or diminishing npcrturc nntlcr thc nbovciiicntioucd :idjustiiicnts nnd cnlnrgcrnciits of ncwspnpcr photogrilplis, wcrc s h o i ~. REFERENCES 1 Cnrpcntrr's '' Tlic Jlicroscolic nitd its Rcrclntiniis " rcrisctl by I'. If. 1)nllingcr ; J. & A. Cliiircliill. 2 '' Jlicroscopy," by E. J. Spittn ; Jolii~ Jlnirity, Loiidoii. 3 '' l'ritcticnl Jlicroscopy," by I,. C. Jlnrtiii itnil I$. li. Joliiisoii ; 13lnckic k Son, Ltcl. 4 " Introdtiction t o tlic Tlicory iind Use of tlio Alicroscope," by C. I<. Jlnruhnll ntid H. 1 ) . Griffitli ; Gco. Roiitlcilgc & Sons.